Mac users interested in Malwarebytes for 10.5.8 generally download:
Malwarebytes Anti-Malware is a Mac utility that helps you boost your system protection by finding and removing adware threats from your computer.
AdwareMedic is a program that helps you easily and effectively get rid of any adware components from your system.
Bitdefender Virus Scanner is one of the best antivirus tools developed for Mac users.
Bitdefender Adware Removal Tool is a free app that quickly eliminates adware from your Mac.