PDF malware analysis — malicious · 3a9722e69d7bac6e

MALICIOUS

PDF

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

MD5: 690ac901c0ba8c80b52bae9a6a1371d1 SHA-1: 5997f902d79261e4ad176e31cea34b749c988d68 SHA-256: 3a9722e69d7bac6ecfe44746819bafa77f647bccd101427233ad2567e69ede2e

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. Specifically, the 'PDF_METADATA_EVAL_STAGER' heuristic indicates that JavaScript within the PDF metadata is used to decode and execute a payload. The 'String.fromCharCode' heuristic further suggests obfuscation techniques are employed. No specific URLs or file paths were extracted, and the document body is minimal, providing no contextual clues about the intended lure.

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` `442f1a063a8982d356ca5dda2ec2c6409ffce3a4bcb570b1e8c0d646d6bd67f5`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6217	458 bytes

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