Pulsif.zip -

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.

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. Pulsif.zip

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 Because the ZIP header is malformed, nearly 95%

The file appears unreadable or corrupted to standard tools like Windows Explorer, 7-Zip, or WinRAR. However, attackers bundle a custom loader with the file that "resurrects" the malicious payload by correctly interpreting the malformed data. Because the ZIP header is malformed