Courtesy to Twitter user XdanielArt (date of publication: 8 June 2024)
this post was submitted on 30 Apr 2025
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Building off of this, the PDF standard supports all sorts of craziness. It can have embedded math and logic similar to excel files, to the point there's templates available for banks which will automatically calculate entire loans (including weird ones like balloon mortgages and variable interest rate stuff) without leaving Adobe Reader, and the recent Doom PDF and Linux PDF projects exploit the fact that pdfs support embedded javascript.
There's also an actual market for enterprise PDF templates like the banking ones I described with automatic calculations and whatnot. So some people literally make their living selling PDFs to businesses that businesses actually use