Files named with raw timestamps like this usually originate from:
Many CMS platforms (like WordPress) or database tools generate backup files named after the exact second they were created. 1639885504.zip
using a reputable service like VirusTotal , which checks the file against dozens of antivirus engines. Files named with raw timestamps like this usually
If this was found in a specific folder (e.g., a "Downloads" or "Backup" folder), the surrounding files may provide context as to which application generated it. a "Downloads" or "Backup" folder)