PDF malware analysis — malicious · 9612199f76018062

MALICIOUS

PDF

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

MD5: 470c4693644f2c8f5224f42548f65e76 SHA-1: 20790f4708eb3859fdb51a21d5e2060bf9d75812 SHA-256: 9612199f76018062ccb40f6503e8021ce9d097d1936192148a342630e2060d5b

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by multiple heuristics including a 'PDF_METADATA_EVAL_STAGER'. This stager is designed to decode and execute JavaScript found within the PDF's metadata. The use of String.fromCharCode further suggests obfuscation techniques common in malicious PDFs. While no specific family is identified, the method indicates a downloader or initial execution stage.

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` `7b2628f024eee89305dfd016eaf8db8493a9492c633458de0190d27c244c7a4e`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6205	462 bytes

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