BitDefender is actually really bad about giving you useful information to go off. Ideally it should tell you exactly what malicious action or malware it's detecting. If your AV does this, you can see if the particular type of detection makes sense.

For example, if it's an executable file with a clearly displayed malware name "Trojan.BadTimes.X" or something, that's really bad news. Same for URLs. However, sometimes AVs will flag "malicious behaviour", which gets trickier. They will often flag qBittorrent or other legit apps that are used to download pirated software, etc.

What you can do is to submit the file or URL that was flagged to VirusTotal. This shows you a comprehensive list of whether any other antivirus software is also marking the file/URL as infected.

Generally though, I'd play it safe. I'd get in touch with the page owner or google around to see if this is a known issue, and unless I can be completely sure it's actually safe, I wouldn't use it.