PDF malware analysis — malicious · 8b2470c95e4a3313

MALICIOUS

PDF

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

MD5: 449e9ea7a62424e4445c7aa264da9ff6 SHA-1: a2c08632ee12ce7428e04505d9651550fb1740de SHA-256: 8b2470c95e4a3313c27f8e19a4278a0db20f8be94d3a7646f8f05a03c59f86bd

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_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER'. The JavaScript uses 'String.fromCharCode' and is likely designed to decode and execute a payload. The presence of 'String.fromCharCode' in the DOC BODY further supports this. The primary technique observed is the execution of JavaScript within the PDF metadata to stage further malicious activity.

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` `d58f962fc8b9367b73a980fc81ebb61464c1c6f8e0f6d1db6c0cdcc7961adadd`	pdf-javascript-stream	PDF /JS object 1 at offset 0x61EE	511 bytes

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