None of the activity looks hugely out of place for opening a pdf. My advice would be to take a known safe pdf, upload that to virustotal and compare the activity results and see how different they are if at all.

There might be differences based on pdf content so best to try and find a similar pdf (images, urls, etc)

Not much. Probably just support for some hardware that needs drivers like my 3d printer. But that’s what Vans are for right. Most other “windows only” apps work fine under WINE. If I have to say one thing: powertoys (some of them)

My thinkpad’s battery is much happier on Linux than windows. It’s hibernate and sleep work as expected. My windows work laptop can’t even wake from sleep properly unless I I open the lid and re plug the dock each time it’s gone to sleep.

I prefer navidrome https://www.navidrome.org/ over Jellyfin for music as I find it much more responsive and it has extra features like smart playlists. Just adding an extra opinion for those interested.

Thanks for posting the update on what you used

Came here to say this. Now I just need to upvote.