Internet security firm Webroot on Monday announced that it has acquired cloud-based, anti-malware solutions provider Prevx for an undisclosed sum. U.K.-based Prevx uses behavior-based malware detection to protect consumer and business customers from malware, including zero-day exploits. Boulder, Colo.-based Webroot plans to integrate Prevx's technology into its cloud security services. This is the second cloud acquisition Webroot has made this year, after picking up website classification company BrightCloud in July. — AM