PDF malware analysis — malicious · c5d30ce911f036f8

MALICIOUS

PDF

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

MD5: ade301be06218c017cf225a675aa9d1d SHA-1: 6f018e6e1b389feb8a1aaf1241d6378c965b4601 SHA-256: c5d30ce911f036f850015a43c4fdc9a069a18b38adc246434e1061b10ae6d186

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: User Execution: Malicious JavaScript

The PDF file contains embedded JavaScript, identified by heuristics such as 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 and script content. The ML classifier strongly flags this PDF as malicious. The primary attack pattern involves exploiting PDF's JavaScript capabilities for initial execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `807524f7dc7c1e48d84e75c775b21f951405da31963b1b7d203ff91051394c04`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6194	459 bytes

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