Banner ad triggering AV warning

[eltawater]

Hello,
Just to let you know that there appears to be a top banner ad tripping my Avast warnings this afternoon.

Details are:

adserve.ams.rhythmxchange.com/rtbdeliver/js?excid=pubmatic&pickup=476bb888720846f6754b3f6043e96688&zrk=be4e61dbae194f289b1ac3cf03e64aa4&zds=b987c89d03c1af857ff15076ab20f03c&imp=904bc671905826db68b134c976632c18&zwp=0.84&pv=1&prc=ZX0.6576802066992968&pg=

JS:Agent-DRL [Adw]

[Doofus]

URL: http://adserve.ams.rhythmxchange.com/rtbdeliver/js...
Infection: JS:Agent-DRL [Adw]
Process: C:\Program Files (x86)\Mozilla Firefox\firefox.exe