From the message you post here, it doesn't shows any infection or whatever, it just says "file corrupted", which means it can't access it and is totally unusable (even for good purposes). It seems just as a warning of a damaged file, not a virus or anything like that. The fact that the CAB is damaged means that the antivirus cannot analyze it and maybe Avast is promptly to warn you about that.
But when in doubt, I prefer to recur to VirusTotal. It's an online site where you can upload files and have them analyzed by a variety of antiviruses on the cloud: https://www.virustotal.com/