[rogerpeters]

I can’t say for sure, I cannot get it to pop that same error again. I will try opening it from another iPhone with lockdown enabled later.

I wouldn’t even know where to start in looking at that PDF for some sort of iOS exploit payload, my guess is it would be extremely difficult to find (if it exists).

[walterbell]

For the historical record, the Usenix Security paper PDF comment currently has 28 upvotes.

There is also your non-reproducible report that the PDF was incorrectly loaded as an Apple Wallet pass, which would require a web server MIME type of:

  application/vnd.apple.pkpass