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2 months agoIt is possible to run code directly inside PDF files, as can be seen with Doom or Linux running inside a PDF file https://github.com/ading2210/linuxpdf
In addition to that can PDF files prepared to trigger security weaknesses and exploits in PDF readers (often Acrobat Reader), to act as an attack vector and run malicious code.
So no, PDF are not safe by design.
There is no locking into Chrome needed, because all big browsers have interfaces for DRM content implemented.