What are /r/Compapexlegends' favorite Products & Services?

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Just so you're aware viewing PDF's in and of themselves is pretty safe. Opening it in the native dropbox renderer or Chrome is fine since those are sandboxed. The real danger comes from opening it in Adobe Reader, which is where all the exploits are.

So don't use adobe reader because it's insecure and also sucks.

I use https://www.sumatrapdfreader.org/free-pdf-reader.html which is also nice because it doesn't support the more interactive PDF features which tend to be the dangerous ones.

That all being said, don't download any actual random exe programs from the internet and run those :).