PDFSIDER Malware Actively Used by Threat Actors to Bypass Antivirus and EDR Systems

Cybersecuritynews •Tushar Subhra Dutta • January 19, 2026

PDFSIDER is a newly exposed backdoor that gives attackers long term control of Windows systems while slipping past many antivirus and endpoint detection and response tools. It uses trusted software and strong encryption to hide its presence, letting intruders run commands, study the network, and move deeper inside targeted environments. The campaign behind PDFSIDER relies […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

PDFSIDER Malware Used to Evade Antivirus and EDR Systems PDFSIDER is a newly identified backdoor malware that allows attackers to maintain long-term control over Windows systems while evading detection by antivirus and endpoint detection and response tools. It employs trusted software and strong encryption to conceal its activities, enabling intruders to execute commands and navigate deeper into targeted networks. 6 sources 37

Extracted Entities

PDFSIDER Malware Actively Used by Threat Actors to Bypass Antivirus and EDR Systems

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Extracted Entities

Attack Types (1)

Malware (1)

Platforms (1)