If it's on MPGH and approved, it does not contain a virus. Your anti-virus detects it as a virus because it can potentially modify components of systems {Which is what you need it to do to hack.}, We Call this a "False Positive" Simply add PerX to your Exceptions list or temporarily disable your firewall, and allow it to download and execute as usual.
[Download] PerX Injector - Battlefield Heroes Hacks - MPGH - MultiPlayer Game Hacking
[Release] Perx+Valkyrie Injector [Noob Friendly] *Updated Regularly* - Combat Arms General - MPGH - MultiPlayer Game Hacking