Bleepingcomputer
PDFSider Malware Targets Fortune 100 Finance Firm with Covert Backdoor Access
First seen 20 Jan 2026, 02:03 UTC
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A new malware strain named PDFSider has been deployed on the network of a Fortune 100 company in the finance sector. The attackers utilized social engineering tactics to gain remote access and installed an encrypted backdoor via DLL side-loading, designed to evade detection and maintain long-term access. Researchers from Resecurity identified this malware during an incident response.
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