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Originally Posted by chickenhead
Cracking: breaking the password to allow text access proved much more fruitful. After unlocking one can use a pdf parse package like many languages have (i used pdfminer for python) and one can pretty reasonably get what they need.
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My understanding related to this is that the vulnerability of hacking the password is dependent upon the number of pages the PDF contains.
A 1-4 PDF is much easier hack than a 10-20 page PDF, with the later likely not possible at all.
The hacking is also dependent upon which bit-range is set by the PDF creator.
A 40-bit (early Adobe) is easily hacked.
A 128-bit is quite difficult.
I've seen some PDF's in the past where the creator added security settings, however never added two levels of passwords, thus the security settings were easily removed. Course, your not able to change these settings with the FREE Acrobat viewer or many of the other FREE PDF tools.
