PDF malware analysis — malicious · bc3603bf9d44cae3

MALICIOUS

PDF

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

MD5: 7349030fd808990829a26b46aec32669 SHA-1: 9b674edb3e7c0bb295d3ac311d54bedbbd475474 SHA-256: bc3603bf9d44cae370eef0f378c9aaa3420bc6eec5a7eb445e930cb2b7aa8e92

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, specifically identified as a 'PDF metadata JavaScript eval stager'. This JavaScript utilizes String.fromCharCode, a common technique for obfuscation, to decode and execute malicious code. The primary function appears to be staging for a second-stage payload, although the exact nature of that payload cannot be determined from the provided evidence. The confidence is moderate due to the obfuscated nature of the JavaScript and the lack of a clear second-stage URL.

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` `fc71320bdc8bf1951ffed4108d0e7ae8c4e04f80ef7878755a631ce14df9b7c3`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62AB	515 bytes

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