PDF malware analysis — malicious · 983f43cabea9bdb0

MALICIOUS

PDF

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

MD5: 81efe33bf1d5eda57806732f3b97d5f9 SHA-1: 47a58a104173938656b466a9b65400a7d3898281 SHA-256: 983f43cabea9bdb0fcfb763fb6867a2f13291fb2b7f1e40a1e4f9768d772f35e

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains JavaScript embedded within its metadata, which is a common technique for obfuscating malicious code. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that this JavaScript is likely used to decode and execute a secondary payload. The presence of 'String.fromCharCode' further supports the use of JavaScript for dynamic code construction. No specific malware family could be identified.

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` `b0c6268ca1510bcad418820ef505a5338e51979a3f7414c8f261ffb84a451012`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6268	442 bytes

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