JavaScript

Unobfuscate a Spammy Email

Demonstrates the Chilkat Email.UnSpamify method, which unobfuscates an email by undoing common spammer tricks — it removes comments from HTML bodies and unobfuscates hyperlinked URLs. This example cleans an HTML body whose link was broken up by an inserted comment.

Background: Spammers deliberately scramble HTML to slip past filters — inserting empty comments in the middle of words or URLs (example.com), or otherwise obfuscating links — so the message renders normally to a human but confuses naive keyword matching. UnSpamify reverses those tricks, producing a normalized body that is easier to analyze, classify, or scan for the real destination of its links.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

//  Demonstrates the UnSpamify method, which unobfuscates an email by undoing common spammer
//  tricks: it removes comments from HTML bodies and unobfuscates hyperlinked URLs.

var email = new CkEmail();
email.Subject = "UnSpamify example";

//  An HTML body with an obfuscating comment inserted into a hyperlink.
email.SetHtmlBody("<html><body>Visit <a href=\"http://exa<!--x-->mple.com\">our site</a>.</body></html>");

//  Undo the obfuscation.
email.UnSpamify();

var cleaned = email.GetHtmlBody();
console.log(cleaned);