Hi Steven Winderlich,

avast! Web Shield flags and blocks access to JS:iframe-CSU[Trj]
Why would you lift webshield for a valid detection. Besides Joomla version for this site is outdated.
Until avast! whitelists that domain for shield detection or unblocks I would not treat it as FP.
Alive malware on same IP: http://support.clean-mx.de/clean-mx/viruses.php?ip=81.21.75.87&sort=first%20desc
See: http://zulu.zscaler.com/submission/show/537f7f26cc2c45f4920f654dbb78bec3-1376420758
→ A/V detection: Security Risk 100/100% malicious
See: http://quttera.com/detailed_report/lanke.historielag.org
What one could do is file a FP report to avast here: http://www.avast.com/contact-form.php
then it is up to avast team members to react…

polonus