PDF malware analysis — malicious · a82ff92557cc050c

MALICIOUS

PDF

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

MD5: 544dca4b4e545c7514e348f105b06975 SHA-1: 092037d70f50a10859cd8e7adaa63def8c20b3c8 SHA-256: a82ff92557cc050cdb5dfc0d957be6a7b26320a13047a8b6646dfc67be246661

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 the JavaScript in the PDF metadata is used to decode and execute a stager. The presence of 'String.fromCharCode' further suggests obfuscation techniques common in malicious JavaScript. While no specific URLs or further script content were extracted, the overall pattern points to a malicious PDF designed to execute arbitrary code.

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` `b0f26c60aed42c9f6e9677a2232b898dde6412485856698cdf5a624ce5dc4804`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6261	467 bytes

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