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bunch of random gibberish?

When decoding to ASCII instead of UTF-8 (like you've done) I got this. It makes a little bit more sense at least, but not much.

I guess the actual shell code starts from line 40 ">>stream..."

It must be using some other encoding, only if we knew which!

It's presumably just a lump of binary ARM opcodes.

We need a debugger or a disassmbler like IDA Pro to make reverse engineering of that code

It's a PDF FlateDecode block, i.e. it's DEFLATEd. The actual payload within may be different, but this much has been used before.

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...