Avast Free Antivirus. Delete files and folders without putting them in the trash. Make sure your Mac is free of infected files. Free Editors' rating. After installing the program, run the scan and check if you were able to delete or quarantine the infected files found. Please follow the instructions above and contact us for further help.
That is Windows malware, and not a threat to your computer. It is in your local snapshots, which are backups kept on your internal hard drive for one week. Anything older than one week is removed. Just ignore this, and it'll be removed on its own.
Mac How To Delete Downloads
This came onto your machine via e-mail, as LowLuster points out. You should NEVER let any anti-virus software remove malware of any kind from your e-mail. Doing so will probably leave it on the server (depending on your Mail settings), where it could be re-downloaded to your computer again, and will also corrupt the mailbox indices. For proper removal, see:
Mac How To Delete Archive Utility
Mac How To Delete Programs
Finally, note that Avast has a serious and long-standing problem with false positives. I don't generally recommend it.