PDF malware analysis — malicious · 2ed945758753d775

MALICIOUS

PDF

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

MD5: 66afccd3e86fe27012caab5a1c34d3a5 SHA-1: f802d7702a9aec54668ce4e385d5d24e9966256a SHA-256: 2ed945758753d775c7af87c40c4be3a858cf6f3839b328ca6be4b772c9e17787

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that this JavaScript is used to decode and execute further code, likely from the metadata itself. The 'String.fromCharCode' heuristic further suggests obfuscation techniques are in use. While no specific URLs or second-stage payloads were directly extracted, the presence of these indicators strongly suggests a stager designed to download and execute additional malicious content.

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` `2313190f1996aa35fe527672856dc6bfbbb2bb7028e08c88e4b82cb7dea02394`	pdf-javascript-stream	PDF /JS object 1 at offset 0x620C	433 bytes

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