Hi mylilfid,
Unfortunately, Win32:Adan-102 is avast!'s name for the virus and doesn't bring up any information on a Google search. The actual file name might.
Leave malware in the chest for a few weeks just to make sure it's not a false positive.
On the scanner interface, you have a chest icon. The malware section has a skull and cross bones. There's a delete option. Malware is inactive in the chest so err on the side of caution. There's no hurry to delete it.
