The malware detection ispossibly in your browser cache. Be sure you clear the browser, restart the computer, manually update WD and run a Quick Scan with WD.
Any new browser extensions that need to be disabled or removed?
Is the file being quarantined by WD? If so, you may want to send a copy to Virus Total for analysis (if the detections continue). https://www.virustotal.com/
Recommend you review and follow the suggestions in https://www.microsoft.com/security/portal/threat/encyclopedia/entry.aspx?Name=Exploit%3aJS%2fMeadgive.
If the detections continue suggest you run scans with the Emsisoft Emergency Kit and AdwCleaner.
https://www.malwarebytes.com/adwcleaner/
You may need to reset your browsers…
https://malwaretips.com/blogs/reset-internet-explorer-settings/
https://malwaretips.com/blogs/reset-chrome-settings/
https://malwaretips.com/blogs/reset-firefox-settings/
http://www.howtogeek.com/237527/how-to-reset-microsoft-edge-in-windows-10/
Regards…
http://blog.emsisoft.com/2015/01/27/top-10-ways-pups-sneak-onto-your-computer-and-how-to-avoid-them/