PDF malware analysis — malicious · 3584e0d166edd6e3

MALICIOUS

PDF

25.2 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 5c5cffb92abe2328bb7c6da077d86c09 SHA-1: e020db559adf7a2ee4a4a9e5c78ba6472d566401 SHA-256: 3584e0d166edd6e3bbe23d811eb014020fe4be28cae35e61e0fe3ff844550f19

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF sample contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. Specifically, the 'PDF_METADATA_EVAL_STAGER' heuristic indicates that JavaScript within the PDF metadata is used to decode and execute a payload. The presence of 'String.fromCharCode' further supports the obfuscation and dynamic execution of code. No specific family could be identified, and the exact payload is not discernible from the provided information.

Heuristics 4

PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `5cc1bb24d2f5e213bba3389689555dd6c93083367b515b0738f395530a84fc64`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6246	461 bytes

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