PDF malware analysis — malicious · 3697d8a327f460bf

MALICIOUS

PDF

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

MD5: a3b5e7af4c226773073522e8a7d0c97f SHA-1: 631aee39b1e24f3708ae4daf03a891661f60d686 SHA-256: 3697d8a327f460bf6a36213f22ecb0c03346358478c0b68f9eb131ee9c9af805

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains JavaScript within its metadata, which is a common technique for obfuscating malicious code. The heuristic 'PDF_METADATA_EVAL_STAGER' indicates that this JavaScript is likely used to decode and execute a secondary payload. The use of 'String.fromCharCode' further suggests code obfuscation. While the exact payload is not directly visible, the overall pattern points to a downloader or stager.

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` `e7ca2a1d7b144538a30d672177f0ca5d81b26221925c2b978d7cf549fdb5bfe4`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6300	526 bytes

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