PDF malware analysis — malicious · 289edf8119ad1d25

MALICIOUS

PDF

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

MD5: 47d9c2c8b450b3d730997799a6584124 SHA-1: 1326b6816fa1e2bd6ae1238b83d0ee8893eb2110 SHA-256: 289edf8119ad1d2510be7d155f1a3add3c5e6485e2b614f3f5a0884bd2fc93d6

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, specifically utilizing String.fromCharCode and an eval stager within its metadata. This technique is commonly used to obfuscate malicious code, which is then executed. The presence of these indicators suggests the file is designed to download and execute a secondary payload, although the specific payload and delivery mechanism are not fully discernible from the provided 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` `d1346a5cc3cb550528a9e778c40cfbbe7da3f2d23312e2b18c8d2dd075678cc6`	pdf-javascript-stream	PDF /JS object 1 at offset 0x625F	529 bytes

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