Just a little curious. Why would you analyze your own product as PUP/malware.
Setup was downloaded from www.ccleaner.online
Ref: cleaner.online
well it is only 5 minutes since piriform became part of avast software 
anyway, correct website URL is http://www.piriform.com/
The URL you provided is Blacklisted
https://virustotal.com/en/url/c8fba40374fc8199f01e1fa977af00bc3d0cd2782554ea558fdfd669d98a9d8f/analysis/1501510608/
Not showing above but also blocked by F-Secure
This seems like fraudulent site. Correct one is:
https://www.piriform.com/CCLEANER
The one you want :-\ seems full of crap
https://virustotal.com/en/file/0bba3419f313e937ec4b2bdb9b6c46b60e7168d01463461dabcf86d488e418a9/analysis/1501510932/
Helps to also use adblockers to protect you from infected and/or fraudulent sites such as:
- uBlock Origin
- Privacy Badger
- Avasts own AOS
Always go to original vendor’s site to get programs. In this case it is piriform.com.
In this case detection by avast is correct.