PDF malware analysis — malicious · def93d03299bce3d

MALICIOUS

PDF

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

MD5: 618e202289caab3f395153167b37cac9 SHA-1: 58cf377774d60a1735848d015f90aecc360f1320 SHA-256: def93d03299bce3d9f4e915777c803a43552c4e1dc9606180882be8cb1e0d725

64 Risk Score

Malware Insights

MITRE ATT&CK

T1566.003 Phishing: Phishing via Service Provider

The PDF file contains embedded JavaScript, specifically identified as a 'PDF metadata JavaScript eval stager'. This stager likely decodes and executes a malicious payload. The use of String.fromCharCode further suggests obfuscation techniques common in malware delivery. While no specific family is identified, the method points to a downloader or initial access 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` `22af05682d725c03d2fd59742c385dd168e0b0416b9f3c4a36cba054757a8884`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62B6	509 bytes

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