PDF malware analysis — malicious · 1a32638e0db9bcce

MALICIOUS

PDF

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

MD5: 540b532fa342b39e30f0dcf9b8279e5d SHA-1: 4d0ef74ca70f588bc4969f9854a7eb8cd76d8646 SHA-256: 1a32638e0db9bccef90dd037dd7947a873525f4328e51e87b331925577fa1923

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER' heuristics. The 'String.fromCharCode' heuristic further indicates obfuscation techniques used within the JavaScript. The primary function of this embedded script appears to be acting as a stager, likely to download and execute a second-stage payload. Due to the obfuscation and lack of specific indicators, the malware family is undetermined.

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` `18de090fd5557afb5d734e72d95c60bbe408630a2ac5b3311f19e1722b7d38ad`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6267	469 bytes

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