Here's a tip: the safest way to open sketchy pdf is through PDF.js that's used in browsers as it relies on the same JS sandbox you use to browse net all day. Ot

Here's a tip: the safest way to open sketchy pdf is through PDF.js that's used in browsers as it relies on the same JS sandbox you use to browse net all day. Other than that - open documents in a VM (with reverting to the previous snapshot after viewing the file) or install Qubes where this is default behaviour.