PDF malware analysis — malicious · fd42493bb62be554

MALICIOUS

PDF

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

MD5: 8d11e0db44b582afa09fe58e4e51c6a9 SHA-1: ac663fc089ef0de6d28c802538cd15b7d340bc78 SHA-256: fd42493bb62be5549b4bd4446fe31ddec2c588cd298ec858f9d13468baf42b77

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that this JavaScript is used to decode and execute a payload, likely leveraging 'String.fromCharCode' as seen in the document body and metadata. The exact nature of the payload is not fully discernible from the provided evidence, but the technique suggests an attempt to download and run further malicious code.

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` `e7d814761a042ada7dfaa3e63952db5eb9d231db144299281197ef7f2bf4665b`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6220	440 bytes

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