Microsoft ForeFront Security for SharePoint 

Microsoft ForeFront Security for SharePoint offers incorporated scan engines and content security features for Microsoft Office SharePoint Server 2007 and Windows SharePoint Service 3.0 environment, including malevolent code, confidential information, and unsuitable content.

A trial copy of Microsoft ForeFront Security for SharePoint with Service Pack 2 is available for download. Moreover, Microsoft has provided us comprehensive guide on product evaluation, deployment, and operations, including user guide and best practices guide.