PDF malware analysis — malicious · fffaba1a2e477028

MALICIOUS

PDF

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

MD5: bd84562f8255faf3f80021f321602b49 SHA-1: ae75829917d8f17a375bcc09882bc5a5951f4f8a SHA-256: fffaba1a2e4770280db4498a294dd8e9f8837b6aebedfeaf0be76f9209e8f59e

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by heuristics like PDF_JAVASCRIPT and PDF_JS. The PDF_METADATA_EVAL_STAGER heuristic indicates that JavaScript within the PDF's metadata is used as a stager, likely to decode and execute further malicious code. The ML classifier strongly flags this PDF as malicious. The use of String.fromCharCode in the document body and metadata suggests obfuscation techniques common in JavaScript-based malware delivery.

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` `d4bd80a29d2d1c5022fbbcce63d79244873b8bb6bfbb2ea6e004005bab33d9ef`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6259	464 bytes

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