PDF malware analysis — malicious · ca0b1198ee096a51

MALICIOUS

PDF

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

MD5: 85d9cdee8d3c9aad791706e25f7c3012 SHA-1: 5fde1b7a83ee3acbc864ad06ea542b9cd449f7e8 SHA-256: ca0b1198ee096a518345fe20a74907b8e9641d5350742fe490a9fd901e39fe58

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 payload. The presence of String.fromCharCode in the document body and metadata further supports the use of JavaScript for obfuscation and execution. The script's likely intent is to download and execute a second-stage payload, though the exact mechanism is not fully detailed by the available heuristics.

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` `ac1b55ad4a0e3c2ef15d9edcc97e4540ca28908dd13eedbe303740d4cf392eb7`	pdf-javascript-stream	PDF /JS object 1 at offset 0x62E6	526 bytes

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