That still sounds like malware to me, even though you're run Malwarebytes. Try booting into Safe Mode (via pressing F8 during the start-up process) and then running Malwarebytes again. (Also, of course, check that you actually 'zap' anything that's found, via the 'Quarantine' option).
If the problem persists then email AB to let them know that there might be a problem with the site (
[email protected] ) . Make sure you provide the following information:
a) the device which you're using (e.g. a Windows PC, an iPad or an Android tablet) ;
b) the browser that you're using (e.g. Internet Explorer, Firefox, Chrome, Safari or Opera) ;
c)whether you're using the 'normal' (desktop) version of AB or the mobile one, if appropriate ;
d) the URL of a page where the ads occur ;
e) what the ads are for.