PDF malware analysis — malicious · e3ffd5ce6fb23193

MALICIOUS

PDF

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

MD5: 0175e8e1cae25e47c4b46c562aa5e2ef SHA-1: e650b9d38e5928b6b61991a2a011f0b85b97362b SHA-256: e3ffd5ce6fb23193c3e793b17b2572232cdef440f5c695d9896d48ea38ec1bbc

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF file contains JavaScript embedded within its metadata, which is designed to decode and execute a malicious payload. The 'PDF_METADATA_EVAL_STAGER' heuristic specifically indicates this technique. The ML classifier also strongly flags this PDF as malicious. No specific family could be identified, but the method suggests 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` `3fccd923e67361664bcaf1ce113d6cce67d52e5d1ef439da40737b4080e65977`	pdf-javascript-stream	PDF /JS object 1 at offset 0x61CC	459 bytes

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