PDF malware analysis — malicious · 391e7bff9666651f

MALICIOUS

PDF

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

MD5: 8c7fc9452d0a21eb541d6749ba04ce7c SHA-1: 9053e3797938759f1862c6a238c93a0825bab604 SHA-256: 391e7bff9666651f4bb04f4ecc76d41b63b29cc79cb1c23fb8958945faa7adb6

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, identified by heuristics like 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 seen in the DOC BODY. No specific malware family is identifiable from the available evidence.

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` `56b882e4e69c232d232259b7920bc9ac8e2fa95afec1dc091ae627487faad9ee`	pdf-javascript-stream	PDF /JS object 1 at offset 0x621F	468 bytes

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