PDF malware analysis — malicious · 59511f91b4950335

MALICIOUS

PDF

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

MD5: 3ab3eab885618484628d952358ecdebf SHA-1: 05ba68bf6f3e46efc43cbdb9d972bcfc5c0d0531 SHA-256: 59511f91b4950335fbbb4bb66c725713cb041adc47d0ee6196a93294ea16eb93

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER'. The 'String.fromCharCode' usage suggests obfuscation. The embedded JavaScript stream, 'javascript_obj0001_000.js', is the primary artifact. The stager functionality in the metadata indicates the script is designed to download and execute a second-stage payload.

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` `de63c812b013e54e77139438905fbfe3a734a4c64694f8f3cdc8463b97fe5d7a`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6210	530 bytes

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