PDF malware analysis — malicious · e6605209f7bf657a

MALICIOUS

PDF

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

MD5: 5dd8517e877b56084d7b0b5295537b0b SHA-1: 576f0579722247441d1bcbf0d91f0b1f594e5881 SHA-256: e6605209f7bf657a0661346c172fab877213659aa5a1b285d9a93935a29d14e2

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, identified by heuristics like 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 payload. The presence of String.fromCharCode further supports the obfuscation and dynamic code generation technique. No specific malware family is identifiable from the provided evidence.

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` `c7ad94183110216c19c30c05d2754089cd175a6b52e069c70223b83ed0cebdd0`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62CF	523 bytes

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