Yahoo is loading malware?

I keep getting a warning from Avast when I go to the Yahoo main page. It says\unp107448889 contains sample of VBS:malware" and when I reload the page I get a different number string.

I googled the VBS:malware but it’s so vague. Is this anything I should be worried about? I abort the connection each time, and going to their subdomains (ie. or does not result in the warning. I suspect it’s a flash ad or something