Look for obfuscated code (long strings of random characters) which is a hallmark of injected malware.
If you must test it, do so on a staging site equipped with security tools like Wordfence or Sucuri . Better Alternatives Farahin.zip
: Use services like VirusTotal to upload the file (if you still have it) to see specific detection results from multiple antivirus engines. Look for obfuscated code (long strings of random