Because the ZIP header is malformed, nearly 95% to 98% of common antivirus engines fail to detect the malware hidden inside during the initial scan.

Once extracted by the custom loader, the payload—which can include credential harvesters, ransomware, or webshells—executes on the victim's system. Why It’s Dangerous

Pulsif.zip is a malicious ZIP archive that utilizes a technique known as (CVE-2026-0866) to remain invisible to antivirus (AV) and Endpoint Detection and Response (EDR) software.

Mitigate Pulse Connect Secure Product Vulnerabilities (Closed)