It isn't a false positive as such, the function that this 'tool' carries out is to kill processes, etc. and like any tool it can be used for good or evil and an antivirus can't determine intent.
You don't say what the malware name was or if it was called a PUP, Potentially Unwanted Program ?
This is a tool that I believe is in the HP restore partition, yes, no, you didn't say ?
If so then it isn't something installed maliciously and can remain, in which case you would want to exclude that file from further scans:
- In the meantime (if you accept the risk), add it to the avast Settings, Exclusions:
avast Settings, Exclusions Add and copy and paste the full path into the window.
If you did happen send it to the chest it can be restored if needs be. But I believe that HP restore partition is protected so you probably wouldn't be able to send it to the chest anyway
To Restore it to its original location, open the avast chest and right click on the file and select Restore.