Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4105058b985351…

MALICIOUS

PDF

45.1 KB
MD5: 20553894a26bff7bbfc5a96b7ae71030 SHA-1: 4c5d03fabb8a5f136ef4b1bc00b8e2976330163b SHA-256: 4b4105058b98535137ec68f142f5428f7fe5ff666dc1dc1f5d0e3a267dd73c3a
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by a machine learning classifier and ClamAV with the rule Heuristics.PDF.ObfuscatedNameObject. It contains embedded JavaScript, indicating an attempt to execute code. The presence of JavaScript actions and streams strongly suggests the script is designed to download and execute a second-stage payload. While the document body is heavily obfuscated and unreadable, the technical indicators point to a typical malicious PDF delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9671

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
482aaec56d26cae6f11a7730df31be0a814adb6534856b1b63c9c36468a6cc43		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1E5 3606 bytes

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