PDF malware analysis — malicious · bf07e6da8276e1ec

MALICIOUS

PDF

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

MD5: 4ae671476210da0c50f79ee48fe83adf SHA-1: c53201480d74ff5758c617c0675ac33ab928e57a SHA-256: bf07e6da8276e1ec5c96043b412245965a407d9e10e6ef1c5d4426e64aa61eb3

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, identified by heuristics such as PDF_JAVASCRIPT and PDF_JS. Specifically, the PDF_METADATA_EVAL_STAGER heuristic indicates that JavaScript within the PDF's metadata is used to decode and execute a stager. The presence of String.fromCharCode further supports the use of JavaScript for obfuscation and payload delivery. No specific family could be identified, and the confidence is moderate due to the lack of further details on the executed 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` `62c071878512c6bcbe6737f670feda91d616f24f3916c496739928d1d8e32a05`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6215	511 bytes

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