Looks like:
www dot themepunch dot com/codecanyon/revolution_wp/
is the culprit? Not sure why their site was flagged by google, it may have gotten hacked.
The reason Sucuri didn't find anything is because they can't scan your PHP source code with a remote scan like Wordfence does.
You can either remove the slider or wait this out until the site is fixed and marked clean by google. Keep in mind that if that URL is indexible by Google's crawlers you may incur an SEO penalty.
Regards,
Mark.