Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d8c33043fbcccb…

MALICIOUS

PDF

1.89 MB
MD5: 91759ca240eeccc4c742cff341c9a9a7 SHA-1: a8bf33ede7211e16934dc73feba9c620d7d742a1 SHA-256: c5d8c33043fbcccbd2ae9a617f7d392a21a6a5b0386ff7d7965876bb58508eb1
84 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file triggered multiple JavaScript-related heuristics, including 'PDF_JAVASCRIPT' and 'PDF_JS', indicating the presence of embedded JavaScript. ClamAV also flagged it as 'Heuristics.PDF.ObfuscatedNameObject'. While the document body is heavily obfuscated and unreadable, the presence of JavaScript suggests an attempt to execute code. The embedded URLs are related to XFA forms, which are often used in PDF exploits. The exact intent of the JavaScript could not be determined due to obfuscation, but it is likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.1273

Heuristics 5

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
6f305970ef756ee146b511b9f0a248ab47f08d4ae83b0547cdb56a10a8c5a6f5		 pdf-javascript-stream PDF /JS object 12 at offset 0x1E42AF 4604 bytes

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