You can upload one of those files somewhere and use VirusTotal's URL scanner. It uses many different antiviruses' engines and definitions to scan the file for malicious content. This way, if only a few report malware in it, then it's likely a false positive, but if majority of them report, then it's very likely to be true. Although I'm not sure the URL scanner scans inside the file itself... the file scanner has a 20 MB limit unfortunately.