I received no warnings when opening the link. Windows 10 Pro 22H2, Firefox v.133 x64, not running any dedicated anti-virus.
And the document seems fine to me.
A .pdf could get flagged because of potential malware infection. It's not a new attack vector, but it require additional user interaction, such as clicking fake links or links disguised as text in the .pdf that runs hidden scripts.
But the .pdf was extremely slow to load, like double-line ISDN slow. And I'm on a 1 Gbit fibre right now.
As for the content of the catalog...yeah, Fenix makes good products - I know, because I own plenty of them.
But I would really like to see the return of the larger TK-lights. TK45, TK75, and especially the TK76.
A modern TK76, with upgraded versions of the different individual optics of the original, PLUS UV, PLUS Red/Green/Blue lights?
AND removable cells, AND optional battery extenders? RIP wallet, but I would still buy one!