PDF malware analysis — malicious · 1c0aed1e1e0f0f74

MALICIOUS

PDF

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

MD5: 76af03ad3b51df4cf977f4f352e15e9d SHA-1: 67f2a7ec950d8b2a2d6fce5e8949cf27c16f230c SHA-256: 1c0aed1e1e0f0f741f2c3df7720e0143c1c58a475e34aa89520900c2d71bda49

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 indicates an attempt to obfuscate and execute code, commonly used to download and run further malicious payloads. The heuristics strongly suggest this pattern, although the exact payload or target is not directly 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` `e51a4cafe1cd559febcaa388ef2191257d298b5261b896e81ef15802ea36621b`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6225	516 bytes

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