JetCareers on Google Chrome browser (and others)

[SpiraMirabilis]

Visiting JC on the Chrome browsers (and others which have a similar plugin) occasionally present a big red screen and text that reads:

Warning: Visiting this site may harm your computer!
The website at forums.jetcareers.com contains elements from the site www.starrtrax.net, which appears to host malware – software that can hurt your computer or otherwise operate without your consent. Just visiting a site that contains malware can infect your computer.
For detailed information about the problems with these elements, visit the Google Safe Browsing diagnostic page for www.starrtrax.net.
Learn more about how to protect yourself from harmful software online.

Is this from an advertiser which is why it only happens intermittently (when the ad rolls up)?