Hey, Prudential ... a 13-digit PDF password may prevent casual / amateur cracking when nothing is known about the target ... which may match your threat model / business case.
But it only slightly slows down an informed attack.
Assuming only that the target is less than 123 years old ;) and knowing nothing else ... just two lightly optimized attack masks will crack it on a modern rig in under five minutes:
-1 01 -2 0123 ?1?d?2?d19?d?d?d?d?d?d?d
-1 01 -2 0123 ?1?d?2?d20?d?d?d?d?d?d?d
Paweł Masarczyk
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