PDF malware analysis — malicious · 5075e45b1aa7962c

MALICIOUS

PDF

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

MD5: 792195ee26be7718e3cf4b99f4e622de SHA-1: 02c19d9250ce8a143c8c4d7e1a05c686ab84d137 SHA-256: 5075e45b1aa7962ca9be6b25cd956d891d15c8ce3020a2d24ec45208cdb7ddd2

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_METADATA_EVAL_STAGER'. The 'String.fromCharCode' usage suggests obfuscation within the JavaScript. The primary function of the embedded JavaScript appears to be acting as a stager, likely to download and execute a second-stage payload. No specific malware family could be confidently 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` `aac77b835a83bda1e679922a66d2ceb78a836df793ba404cd58f5e37d0af1871`	pdf-javascript-stream	PDF /JS object 1 at offset 0x629B	393 bytes

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