Upload any suspicious installer to VirusTotal.com. A clean NFC PM Pro should have 0/60 detections. If you see 3+ detections, delete immediately.
Official Proxmark3 repository (Original): nfc pm pro software verified download
Package managers (Linux):
Legitimate developers publish hash values. Before running any installer, compare its SHA256 checksum using PowerShell (Get-FileHash filename.exe) against the official hash. Upload any suspicious installer to VirusTotal