Disliked{quote} Off topic: Don't want to appear super smart, but if someone catches a virus/malware via PDF then it's not the fault of the PDF file, but of the user using the wrong PDF reader. Especially one should never use Microsoft, Acrobat or Google readers. It's these softwares which are responsible for - unfortunate - user harm/infections.Ignored
The pdf contains a link, or some flashy button which leads to an infected website.
.ex4/.ex5 files can't be fixed or modified / I'm not a coder!