PDF malware analysis — malicious · 3b6045a00d14ef5e

MALICIOUS

PDF

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

MD5: 6d5070f43b7b6518c5cb8ebab80a4021 SHA-1: 0f3e47fe85ac3021c38466bf4e3fb4f65d46d210 SHA-256: 3b6045a00d14ef5e9c390013046d30fe53a5678a7d8a100c3fe38981d234d728

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_METADATA_EVAL_STAGER'. This JavaScript is likely used to decode and execute a malicious payload, as indicated by the 'String.fromCharCode' usage and the presence of a JavaScript object. The primary function appears to be obfuscating the execution of malicious code within the PDF's metadata.

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` `c3904352b46a95c639e04c29051f037bc368a0e95ec24131186e5a0a5ff1fadf`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62C5	522 bytes

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