Yes, also the same happens with Beyond Keylogger, since 1 month ago behind I sent the direction of the keylogger and up to today it is still undetectable, several keyloggers and programs exist of false of maintenance that they are undetectable for many antiviruses. here I leave to them the page of beyond keylogger:
Keyloggers in themselves can be there for a legitimate purpose, e.g. someone installed them to keep an eye on activity, or malicious use if installed without consent. There is the problem how doe an AV determine intent, like many tools they can be used for good or evil.