Concealed is Concealed
That only works if you don't get caught. I don't know Georgia law but, in Nebraska, "No Guns" signs have the force of law. If you are caught carrying past one, the first conviction is a misdemeanor and subsequent ones are felonies. I can't think of anything at a shopping mall that would justify risking a criminal record.
There are better ways to deal with businesses that prohibit firearms. A local mall proposed doing that but changed their minds after many concealed handgun permit holders contacted them with the question, "Why do you want to alienate the customers who are least likely to cause problems?"