this post was submitted on 05 Feb 2026
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Yes, it's base64. And what's behind it could be anything that can be attached to an email.
In this case, it's a PDF. If the base64 text can be extracted accurately, then the PDF that was attached to the email can be recreated.
The challenge is basically twofold:
As for my approach, I'm basically just slowly and painstakingly running several OCR tools on small bits at a time, merging the resulting outputs, and doing my best to correct mistakes manually.
Ah yes pdf is a clusterfuck where anything is valid I think, so minimal redundancy.
Text and image formats are way more lenient and are full of redundancies.