Avast blocking Trojan while launching Yahoo Mail

Hello,
I have a client who uses Yahoo Mail for her email and Avast free Antivirus for her internet security.  When opening her mail through Yahoo's website she gets the alert that Avast is blocking a trojan - JS:ScriptPE-inf [Trj].  Attached is the Alert Information from Avast's Website.  The "Trojan" is moved to the Avast Chest.

This happens in both IE and Chrome.

Suggestions?
Thanks,
Mags
Avast-Alert.jpg
MagsOwnerAsked:
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Dave BaldwinFixer of ProblemsCommented:
That is most likely coming from an advertisement on her email page and has nothing to do with her browser.  While Yahoo probably tries to keep malware out, sometimes the advertisers sneak one in.  Have her try again later.
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Kent DyerIT Security Analyst SeniorCommented:
Another way to try this, is from a Smart Phone/tablet or another device - since this is a browser-based e-mail.

I would check to be sure that you the previously found virii removed completely.  Especially, if you are able to get in on another device and you come back to this one and still cannot get in.

HTH,

Kent
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COBOLdinosaurCommented:
That message is generally fired for an image that is not really an image; but code.  Frequently it is used in iframes and email, and frequently it is hosted on a compromised server with a Russian IP.  The actual payload can be anything from adware, porn popups, or a botnet infection virus.

Yahoo catches it most of time, but as long as the AV alerted there is no problem.  Delete the spam and any email that is from a non-trusted source.

BTW it can also get past gmail sometimes.

Cd&
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MagsOwnerAuthor Commented:
Thanks for the feedback.  All is now well...no my Avast alert popup!!
Mags
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