sorry, I don't know what you are talking about. Unmark what threat?
Are you looking for assistance with Acrobat Reader? Sorry, but you asked your question in a forum dedicated to helping those using the Adobe RoboHelp application.
If it's Acrobat Reader you are having issues with you need for the users of that forum to see your question. Please advise. I can move your thread to the proper venue where you may receive assistance.