[jeroenhd]

Looks like your OS thought it was a travel pass (but it wasn't). I think that's a buggy iOS feature, not some kind of cyber attack.

[rogerpeters]

I’d say try turning on lockdown mode and opening the PDF, but just in case, maybe scan it on VirusTotal (I just did it’s first ever scan) and check out the behaviour analysis, there seems to be a lot going on compared with other PDF’s I have scanned. Dropped javascript and more.