Aoruk

Confirmed it’s related to the TimThumb vulnerability issue. Posting links here because it helped me cleanup my site.

https://www.ads-software.com/support/topic/attention-igit-related-posts-with-thumb-image-after-posts-phpremoteview-attack?replies=26
blog.sucuri.net/2011/08/timthumb-php-security-vulnerability-just-the-tip-of-the-iceberg.html
https://blog.sucuri.net/2011/08/wordpress-sites-hacked-with-superpuperdomain-com-attacking-timthumb-php.html

One of our visitors also complained about this error, however, I couldn’t replicate it. I checked our website through online scanners and they couldn’t find any malware or malicious activity.

Could it be a ‘false-positive’ that should be reported to AVG? Check out these links:
https://forums.avg.com/ww-en/avg-free-forum?sec=thread&act=show&id=131939
https://www.avg.com/ww-en/page-rating-report

Please send any update when you can. Thank you.