PDF malware analysis — malicious · b8709cfa9261f265

MALICIOUS

PDF

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

MD5: 4c4126738b8264c25a6346594a6455ec SHA-1: b55ae22b7285fd473a7d00dc4d1cb1bbfaa7fed5 SHA-256: b8709cfa9261f26570a8b0cf9ecea191ffce9f8b460cdb538925febf658fd753

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

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 use of 'String.fromCharCode' further suggests code obfuscation. While no specific family is identified, the overall pattern points to a downloader or stager.

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` `e6db382600560be26a44571b7cf70ac792250fe91870131eb23eff05ee8605b0`	pdf-javascript-stream	PDF /JS object 1 at offset 0x620D	450 bytes

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