PDF malware analysis — malicious · 3fbb12e537078d06

MALICIOUS

PDF

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

MD5: 4c89712f69083efec47d67510df02e14 SHA-1: a97c51b8739274be4c385c3210fc2790899746e6 SHA-256: 3fbb12e537078d0604a670d4978e08aa467b2d6f0e519d853d3eec1b06e47fc8

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 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' function is used, suggesting obfuscation. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload. The file's metadata also contains JavaScript, further supporting this attack vector. Due to the obfuscation and lack of specific indicators for a known family, the family is classified as unknown.

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` `4e98fdf844e2e914af185cdd6f47cb13302f784441907f94d15313cf7ad0670b`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6219	464 bytes

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