AVAST not finding Adware.SuperWeb .Surftastic .YTDownloader WHY ??

Avast Free Antivirus / Premium Security
1

I have been seeing some ads popping up bottom right of the screen.

I have run Avast, MalwareBytes and Superantispyware and none of these found anything. A friend suggested another app (will not mention here as I don’t want to sound like I’m promoting that) and it found 3 very quickly.

Adware.SuperWeb 4 objects
Adware.Surftastic 14 objects
Adware.YTDownloader 42 objects

Why is Avast Premier not finding these ??

thanks

2

Is PUP MODE Enable on Avast? By default it is off.

3
Why is Avast Premier not finding these ??
No security program have 100% detection or zero false positives

Did you also consider that this “other app” may detect these as false positives?
Test files at virustotal.com

Also, AV vendors prioritise the dangerous stuff