PDF malware analysis — malicious · 256e3400c620a10d

MALICIOUS

PDF

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

MD5: 68292a24d429b791597fbc36143d7109 SHA-1: 3eeda08a6ad0e87ad6c1e2a71e41e30d72afb551 SHA-256: 256e3400c620a10d9ed9082a7fd69a26644606d93eec0be7466c5c43e9c89c4e

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file 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. The confidence is moderate due to the obfuscated nature of the script and lack of specific IOCs beyond the embedded script filename.

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` `950d413f23f039c15a2076de5cd2c902dcff923ff87b4386a8e1934c0401bcb9`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62CE	435 bytes

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