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Hackers Exploit Adobe PDF Flaw for Months to Steal Data, No Fix Yet

ID: 753ba53f-0977-5fd0-888f-e4860344c792

STIX ID: report--753ba53f-0977-5fd0-888f-e4860344c792

Feed Name: TechRepublic Security

Threat Score
90/100

Date Published: 2026-04-09

Date Updated: 2026-05-05

Author: Ken Underhill

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Attackers have been exploiting a zero-day in Adobe Acrobat Reader via specially crafted PDFs that trigger on open to extract local files, fingerprint victim environments, and enable follow-on remote code execution and sandbox escape. The targeted campaign—active for months—used Russian-language lures tied to the oil and gas sector; Adobe had not released a patch at publication, and mitigations recommended include disabling JavaScript, using isolation, enforcing least privilege, and monitoring for suspicious Adobe API/network activity.

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