PDF malware analysis — malicious · fce6292963108251

MALICIOUS

PDF

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

MD5: 520870d70d621fbc83a833f204dc22a4 SHA-1: cae504d0be71c75f1ea44abb9ccd91d48b75722a SHA-256: fce629296310825161a3f0562fbbb5fb0cb0cc2aceacba6f0748a141406969bd

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains JavaScript embedded within its metadata, indicated by the 'PDF_METADATA_EVAL_STAGER' and 'PDF_JS' heuristics. The use of 'String.fromCharCode' suggests obfuscation techniques common in JavaScript payloads. This embedded script is likely designed 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` `a552a2e245eaec025fffa971cfd6e3b9edfaa26df7f102e2e84295d7d57a59b4`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6237	452 bytes

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