Well this is no indication it is infected.
An archive is by nature inert and has to be extracted, if it is truly corrupted that can't happen. If it isn't corrupt, when the suspect file is extracted avast could then be scanned again and this time it wouldn't be in the archive, so could be moved to the chest and also investigated further.
Deletion isn't really a good first option (you have none left), 'first do no harm' don't delete and never delete without being certain.