Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e28832dfb127434…

MALICIOUS

PDF

10.4 KB
MD5: fe38016b0dee3e87001508685a0eaeaa SHA-1: 9832c15877e16362c738d728de8ae51f199c0a2f SHA-256: 5e28832dfb1274341ca7bad9a658acd014b3b45dae5a7605da34bfbd416bf1d8
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of an embedded file and XFA form suggests an attempt to exploit PDF viewer vulnerabilities for code execution. The embedded file, named 'embedded_file_obj0001.bin', is the primary IOC, likely containing a secondary 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
7c1a14e8739c60c8bbf1f0495f160670c7f39e778a27fbace56d73e7dca07512		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x92 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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