Do you have the of the file, or can you describe the context of where it was found so I can look for related attack patterns?
If found on a corporate machine, isolate the host and pull the pill01.7z file for professional SOC (Security Operations Center) review.
Does it attempt to write to Registry keys or Startup folders? Recommendations
A small archive that extracts into a massive file (a "decompression bomb"). 3. Dynamic Analysis (Sandbox)
Before opening the archive, you should generate cryptographic hashes to identify the file across global databases like VirusTotal.
Run a hash tool to see if this specific archive has been flagged by antivirus vendors.