PDF malware analysis — malicious · efe032176e3650da

MALICIOUS

PDF

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

MD5: 4154e0f5523f5f26ac27f58fc8dc9309 SHA-1: 80cd901a6e35de711f81990a2237cdc0d7ef0c30 SHA-256: efe032176e3650dabcf81c96328ef4e6b90183ef8d752ccb939308134b252afa

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, triggered by the 'PDF_METADATA_EVAL_STAGER' heuristic. The JavaScript uses 'String.fromCharCode', indicating an attempt to obfuscate code execution, likely to download and execute a second-stage payload. The specific family is not identifiable from the available 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` `22a5580e45f23be1d07e559442ac048f69b34fa02866de892980265b27660c0b`	pdf-javascript-stream	PDF /JS object 1 at offset 0x623C	463 bytes

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