PDFs are the scariest file type. They can execute JS, include 3D models, hold hidden fields and metadata you haven’t invented yet. Design fillable fields and then format them with CSS. Every page is an image with text that was scanned with OCR instead of just holding text data. You can embed videos for playback or audio to irritate your unfortunate victim. You can apply digital signatures, or encrypt your document.

Who the fuck designed this thing. No document format was ever made for this. It’s madness.