PDF Password cracker cracks open any PDF if supplied with a guess. It's build using PDFJS Lib (by Mozilla) to loop over a user provided prefix, a range of numbers and a suffix to show the password which can open a password protected PDF.
Hosted on Github Pages: https://vishwarajanand.github.io/pdf-password-cracker
Blog is published at: https://vishwarajanand.com/tech/released-pdf-password-cracker
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Build using PDFjs lib from Mozilla, link here.
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CLI Version shared on this Github Gist.