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New Zero Day Adobe Acrobat Reader Vulnerability Analysis – Part 2

ID: 5f5a1ab3-b1fc-55ac-abfe-fb30dae608ec

STIX ID: report--5f5a1ab3-b1fc-55ac-abfe-fb30dae608ec

Feed Name: Zscaler Security Research Blog

Threat Score
75/100

Date Published: 2025-04-02

Date Updated: 2026-05-01

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This report walks through a hands-on analysis of a malicious PDF that exploits an Adobe Reader vulnerability via JavaScript. The author creates a test PDF, inspects the crash in a debugger, identifies a memory-free issue in the util.printd() method, and demonstrates successful proof-of-concept code execution (shellcode that launches calc.exe) after adjusting the exploit payload — indicating the vulnerability enables remote code execution and that real shellcode could run silently.

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