system
10
Proisp was unable to find the code, or otherwise help me, but I finally found a solution to the problem. I found my exact problem here:
http://joomlaboy.com/tutorials/joomla/88-solved-autson-slideshow-clickjack-issue
I did what it said to do, and securi no longer finds any viruses. The reason it showed on several joomla articles, was because it’s a slideshow which shows on the whole website.
Removing the code did not destroy the usability of the slideshow either. 
I’ll ask a few of my friends who are using avast-antivirus to check out the site and confirm that they’re no longer prevented access. Unless something changes, I consider this case closed.
Many thanks for the help!