Jsfiretruck: exploring malicious javascript using jsf*ck as an obfuscation technique

Intel Name: Jsfiretruck: exploring malicious javascript using jsf*ck as an obfuscation technique

Date of Scan: June 13, 2025

Impact: High

Summary:
We recently uncovered a widespread campaign in which threat actors compromise legitimate websites by injecting heavily obfuscated JavaScript code. These scripts silently redirect visitors to malicious pages delivering malware, exploits, or spam. The attackers use an obfuscation method known as JSF*ck (term redacted for profanity). Throughout this article, we refer to it using the nickname “JSFireTruck.”

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