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.

Since "Bcydhja zip" appears to be a specific, likely auto-generated or obscure file name, a helpful blog post should focus on the of unexpected ZIP files. Download Bcydhja zip

Be wary of messages claiming you must download this file to "fix an error" or "view an invoice." Upload the file to a service like VirusTotal

Below is a draft for a helpful, security-conscious blog post. How to Safely Manage and Download "Bcydhja.zip" likely auto-generated or obscure file name

If you are 100% certain the file is from a trusted source, you can open it using built-in tools: Are Zip Files Safe to Open?