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You would probably like the James Mickens video "Life As A Developer: My Code Does Not Work Because I Am A Victim Of Complex Societal Factors That Are Beyond My Control"[0]. He starts talking about the Adobe PDF reader at 19:30.

[0] https://vimeo.com/180568023

I still love that the SHA 1 collision was able to change the color of an image in a PDF, due to the junk data present.

Thanks for that link.