[TheSpiceIsLife]

The example I quoted simply doesn't look suspicious. (Because pdf is a 'safe' filetype.)

Safe?

https://www.cvedetails.com/vulnerability-list/vendor_id-53/p...

[logicallee]

Yes, safe. I open it safely in Chrome (I just click, Chrome opens it natively in the same view) and the chance someone is going to burn a PDF zero-day for chrome on a random link I come across is vanishingly small.

You can open PDF files in Chrome. Even malicious ones. It's okay.