PDF malware analysis — malicious · fd2bb3b475cd1a14

MALICIOUS

PDF

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

MD5: 5037ba9c241422cffe9e133542c9e202 SHA-1: f7cb299b283a5c28172eaa0c40a649a78ef1ba96 SHA-256: fd2bb3b475cd1a14111340540cb78440ce124eeb9d3379efb0b9bbe123a08ede

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 'String.fromCharCode' usage suggests obfuscation. The embedded JavaScript stream, named 'javascript_obj0001_000.js', is the primary artifact. This JavaScript is likely used to download and execute a second-stage payload, a common technique for initial access.

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` `24555ce5e1bb0ef988b227aee981a133a8ec1cf736d3029c42033b4a24fe2fa9`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6320	388 bytes

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