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It's compressed with FlateDecode; if you decompress it you can see the embedded .pfb, which has the actual exploit.

thank you comex, I did not actually found how to decompress it, I keep trying with pdf-parser with no luck

I've succesfully extraced the font with pdf-parser with this command: "python pdf-parser.py --object 4 --filter --raw pdfexploit.pdf > font.pfb" everything is documented here http://www.bufferoverflow.it/2011/07/06/jailbreakme-ecco-com...