PDF malware analysis — malicious · 255409867a7439bd

MALICIOUS

PDF

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

MD5: 73832fbea8d648e3d30c11d410f3b99d SHA-1: c946ea2df83c978deabd6a0e26f386d84cc643ae SHA-256: 255409867a7439bd7ff08cebee9ee6160c738808ac46919a6f767bac4d5e0fba

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 within the JavaScript. The primary function appears to be a stager, indicated by the 'PDF_METADATA_EVAL_STAGER' firing, which likely decodes and executes further malicious content. No specific URLs or network indicators were extracted, and the family is not identifiable from the available data.

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` `e21dbfce0e6942349cc350881ccf8325c46e9f61c8e17370c9027c334e78469f`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62B4	526 bytes

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