Accidentally downloaded a virus? Malware?

A

AC Question

Well typically this is never a problem for me and it never happens. The ad will come up and I will just delete the tab with the pop up on it. Several of them came up this time and thinking I was going back to my original tab I clicked straight on another and it immediately downloaded something that was I wanna say 68KB? Anyway AVAST picked it up right away and I deleted it. But could kt have left anything else behind? Even though I deleted it is it still a problem? Should I just factory reset to be safe?
 

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