[worewood]

What you mean with "PDFs with malware/executables"?

If you're talking about embedded active content within them, then a reader application can just ignore/not run it.

If you're talking about a crafted PDF that exploits, let's say, font rendering bugs inside the reader than it's near impossible. Keep your applications updated.

[arunsivadasan]

There is a Chrome addon called SquareX https://chromewebstore.google.com/detail/kapjaoifikajdcdehfd... The founder is pretty reputed in the Cybersecurity field.