Malicious PDF — malware analysis report

Static analysis result for SHA-256 63941f3ae134b0dd…

MALICIOUS

PDF

10.5 KB
MD5: d59a6744475b997a57c367b67e29b313 SHA-1: 0fa15d621118f845b2d47a7d3f84d3a3b024230f SHA-256: 63941f3ae134b0dd090c9f41669af8a275707978309d44ed23c0a39d9b9218c7
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV's detection of an obfuscated object and a machine learning classifier indicating maliciousness. The presence of an embedded file and XFA form suggests an attempt to exploit PDF reader vulnerabilities for code execution. While no specific script was directly extracted, the embedded file is highly suspicious and likely contains the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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/1.0/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
de2d7fdaefa13a332360c06799a4bace8d41e58ab19be532bd502a69a90287df		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x86 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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