I love when my Mac declares random PDFs malware and deletes them when I try to open them.

On two occasions I've been completely dumbstruck when the software I was using was deleted out from under me. I'm not a fan of the overuse of "gaslight", but it sure felt like that when I had to restart Docker and the OS was like "what do you mean, Docker? You've never had Docker installed! What are you talking about? Are you feeling ok?"

https://news.ycombinator.com/item?id=42649790

In ten years of using Macs, I have never encountered this behaviour. I've never heard this from anyone else either. Is this new in Tahoe? I haven't upgraded yet, but your link seems to be from before Tahoe was released.

Maybe the PDFs were malware?

Sorry to say but your PDFs were malware. In 20+ years I’ve never seen this on my Macs nor the literal thousands I’ve managed with various MDMs.