this post was submitted on 01 Feb 2025
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Linux running inside a PDF file via a RISC-V emulator (github.com)
submitted 5 months ago by yogthos@lemmy.ml to c/programming@lemmy.ml
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[โ€“] HiddenLayer555@lemmy.ml 13 points 5 months ago* (last edited 5 months ago) (3 children)

That's really impressive but has massive security implications.

the PDF file format supports Javascript with its own separate standard library. Modern browsers (Chromium, Firefox) implement this as part of their PDF engines.

This is something that really shouldn't exist. I can't imagine the legitimate uses for this outweigh the ways to abuse it.

Documents shouldn't be allowed to run code. Ever.

Incidentally, anyone know which Firefox flag to set to disable running JS in PDFs entirely?

[โ€“] CaptainBasculin@lemmy.ml 2 points 5 months ago

While a small subset of JS's capabilities are implemented within browsers due to security concerns; its full functionality exists in some PDF readers, notably Acrobat.

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