PDF malware analysis — malicious · 4cba5fc8da2d91df

MALICIOUS

PDF

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

MD5: 6766766cec156abcdc01e221963d3181 SHA-1: a6a33b1de7a523018b92f5765821d7ae68eacf90 SHA-256: 4cba5fc8da2d91df431109143cd448e494192428e93e354b6d3b9d80bf0e472a

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by heuristics such as 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_METADATA_EVAL_STAGER' heuristic indicates that JavaScript within the PDF metadata is used to decode and execute code. The presence of 'String.fromCharCode' further suggests obfuscation techniques common in JavaScript-based malware. The script's likely intent is to download and execute a second-stage payload, although the specific URL or payload is not directly extractable 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` `0c4349d5724ede42bfb0cf6ae41f53fed0985fda0b22e06596da8904afd0aa06`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6301	522 bytes

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