How to Detect Spam Content in Documents Using C#

Enterprise endpoints accept file uploads from a wide range of sources, including vendors, customers, partners, and anonymous external users. The content within those documents is largely trusted by default, especially if it passes a virus and malware scan. The problem is that this doesn’t account for a different type of risk: documents that are free of malware but stuffed with spam content. That can mean anything from phishing attempts to unsolicited commercial material; some of it is dangerous, and some of it is just plain distracting.

Documents arrive looking legitimate, clear standard security checks, and then end up in front of a reviewer or downstream system carrying content they weren’t supposed to. Text-based spam detection doesn’t help here because the content isn’t arriving as email text: it’s arriving as a file, and evaluating what’s inside that file requires a different approach.