"Every virus born as undetected, we need prevention not detection"
That's it.
Every Antivirus is not anymore a pure Antivirus it's much more and even if I understand that a AV can fail where another succeed I want some reliable solution not only in detection but even in prevention and even if that was the first time in years Avast failed for me that was shocking because it was something I cannot tolerate it fails on.
I'm a tech and the problem didn't happen directly to me. I'm enough aware to avoid myself this kind of threat - a pdf file does not have an exe extension - but for my mother what matter is the logo.
A cryptolocker start a massive cripting activity, I cannot understand an AV that does not suspect anything and prevents it. I need to stop Avast so many times because of my administrative scripts when I test them and I have to tolerate a cryptolocker activity not prevented: it's simple absurd!