PDF malware analysis — malicious · 8e6a82c32e169e16

MALICIOUS

PDF

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

MD5: 4e29b2574d6386c9c067a3d70517e25d SHA-1: 99e94ff85a0acae6cfe5b4e72f4a3b63c2b5ac9f SHA-256: 8e6a82c32e169e167045e32474f8a88d2c0d19ab4827ed8dd9b3739732ce98ab

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 JavaScript within the PDF metadata is used to decode and execute code. The 'String.fromCharCode' usage further suggests obfuscation techniques common in JavaScript-based loaders. The embedded JavaScript file 'javascript_obj0001_000.js' is the primary artifact, likely responsible for downloading and executing a second-stage payload.

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` `aacd1ff660f965af2cf08a5698e4657cf25ea077952f56cdbcfdf5c4a73b7f29`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62DD	520 bytes

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