hey and welcome to the forum. i suggest send them to the chest. its a protected area where the malware can’t do any harm to your system. and you get more opition of dealing with the infected files rader if you hust delete them.

you can relax avast have protected you from the threat so no worry there.

if you want a second opition a program thats highly recomended also alongside avast is malwarebytes antimalware witch you can download and try and see if that comes up with anything avast might have missed.

http://filehippo.com/download_malwarebytes_anti_malware/

download install update and do a scan, don’t forget to remove what it finds. a system reboot mightbe needed.

good luck.