Upload the file to a service like VirusTotal. They use over 70 different antivirus engines to check if the file is known to be malicious.
While the ZIP format itself isn't a virus, the within it can be. Malicious actors often use random, nonsensical names like "bcydhja" to bypass simple spam filters or to trick users into downloading "needed" software. Red Flags to Watch For: Download Bcydhja zip
If you have already downloaded the file but haven't opened it, follow these steps to stay safe: Upload the file to a service like VirusTotal
If you weren't expecting a file from the sender, treat it as a threat. treat it as a threat.