Question Mac OS malvertising

Jul 23, 2019
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I've recently been reading a lot about malvertising for my own personal protection. I have a general understanding, yet I don't understand exactly how a system is infected. I know clicking on a possibly malicious ad is extremely risky, but (specific to the MAC OS) how does a system become compromised without the user clicking on an ad? I can't seem to find a good/clear answer anywhere online, so thank you for your help.
 

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