Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9b445be8a2145c…

MALICIOUS

PDF

415.8 KB
MD5: ecc819782f6014b7de8e46fa25f3d1d9 SHA-1: 5d33f9318acd3f22ac3ad4da231645d60fe9e9d1 SHA-256: ef9b445be8a2145c412c76ff623000cef0912586871b5ecfbc4b556a8462713b
84 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits multiple heuristic firings related to JavaScript and XFA forms, indicating a high likelihood of malicious intent. ClamAV detection as 'Heuristics.PDF.ObfuscatedNameObject' further supports this. While the document body is heavily obfuscated and unreadable, the presence of embedded JavaScript suggests an attempt to execute code. The embedded URLs, though not directly malicious, are associated with the PDF structure and may be used in conjunction with the JavaScript to achieve a malicious outcome, such as delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3934

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
c4ba3591c3074e8fbc2f51681f2267ae4d6650196a96437268cf3aa864f515e3		 pdf-javascript-stream PDF /JS object 12 at offset 0x67308 5835 bytes

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