PDF malware analysis — malicious · 47a3d1c1a0bdf317

MALICIOUS

PDF

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

MD5: 8430be73f0c82043a2f72e9f57ce2379 SHA-1: 1da9a717a7f8997f2368c6a4886b52ea9b85466d SHA-256: 47a3d1c1a0bdf317bba4c9c8b36d022be41be63febdc711c5af400d2942713bd

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. Specifically, the 'PDF_METADATA_EVAL_STAGER' heuristic indicates that JavaScript within the PDF's metadata is used to decode and execute a stager. The 'String.fromCharCode' heuristic further suggests obfuscation techniques are employed. While no specific URLs or hashes were extracted, the presence of a JavaScript stager strongly implies the document's purpose is to download and execute a malicious payload.

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` `3f9f4d5363c3369c09af7938a4e3bd56162f54fd761adf94c1c63131b8857314`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62BE	525 bytes

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