The Malware.Heuristic.100X detection names come from a new aggressive heuristic which detects malformations in PE headers which are typically found in malware and viruses. If a file or application is detected as Malware.Heuristic.100X it does not necessarily mean that the file is malicious. It simply means that it's PE structure is similar to that of malware and viruses. This setting, which can be found under ["Settings > Security > Expert systems algorithms"], is OFF BY DEFAULT.