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cracking a pdf

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cracking a pdf
nopofnop Offline
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#1
05-13-2016, 10:56 PM
Hello,
Total noob Smile
So I have a pdf - unable to open without a password. I have zero idea of the length , characters or anything about the password. I know the pdf has 128 bit RCA4 encryption. I only have a intel core i3, and no gfx cards.

1) Is it possible to crack the password in reasonable time < 1 month? A brute force program is telling me 1 year+.

2) How do I go about this ? I have generated the hash using pdf2john.py and tried using hashcat but it just keeps telling me hash was not read.

Thanks
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nopofnop Offline
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#2
05-15-2016, 07:55 PM
Hey, OP back again thank you - I read as much as I could understand. So Now I have oclhashcat running on my windows 10 machine with an old Nvidia Quadro FX580 ( supports cuda ).

I open the CMD window , and from inside the hashcat directory execute
>...64.exe -m 10500 -a 3 name.hash

and everytime I just get back some complaint about "line length exception" no hash found. I have tried using 10500,10410,10400,10600,10700 but it makes no difference.

What do I do ?
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Xanadrel Offline
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#3
05-15-2016, 08:36 PM
Read the basic usage of hashcat.
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nopofnop Offline
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#4
05-15-2016, 08:56 PM
(05-15-2016, 08:36 PM)Xanadrel Wrote: Read the basic usage of hashcat.

I have tried to read, but I honestly do not understand - I need to use the mode associated to a certain type of hash - I looked up the example page on the wiki - but really I am lost.
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