PDF malware analysis — malicious · c60520a39d3f6318

MALICIOUS

PDF

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

MD5: 546fa8edc3c29263868ba809b01fc6a2 SHA-1: 3e5d29a10ad151776ddbc5eeae1f73bd912c267f SHA-256: c60520a39d3f6318f0dd81c8d78fd55a7f1603d672fe3371468822d7efaafe6d

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, identified by heuristics such as 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that this JavaScript is used to decode and execute a payload, likely leveraging 'String.fromCharCode' as observed in the document body and artifact names. The exact nature of the payload is not discernible from the provided evidence, but the technique suggests a downloader or initial execution stage.

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` `2dcdd0575289966f2d0d710ae7e9a526d2ba94cb0be80c285d3e37149750dbc8`	pdf-javascript-stream	PDF /JS object 1 at offset 0x621C	451 bytes

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