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An attempt to download that attachment will give a warning from avast ... connection aborted.
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I thought it was going to do that as changing the file to a txt file won't get round what is being detected.
This would appear to be related to a link in a script see below, that avast must have on the network shield malicious sites list. I have tried searching on dontexist.org and can find no reference to malware. I have removed the <tags> and broken the link to try and avoid a direct alert on this page.
script type='text/javascript' src='hXXp://catgirls.dontexist.org/wp-includes/js/jquery/jquery.js?ver=1.2.6'> /script
@ Orochium
You will need to remove the attachment.
I tried to download the attachment to let avast alert and submitted it as a possible false positive, the above text forming the basis of the report and giving this topic's URL.
So hopefully, it will be quickly investigated, as the real problem is the dontexist.org being considered a malicious site by the network shield. So if the web shield also finds it it to would alert but it would refer to the script and not the url like the network shield.
It seems the site must have been removed.