Malicious PDF — malware analysis report

Static analysis result for SHA-256 66358dfdd9a09d49…

MALICIOUS

PDF

10.4 KB
MD5: 2e802c0b3b6b5f75931d09c321cbe3f3 SHA-1: 27821eb108eff085ed3ca6614401d2c7ad876514 SHA-256: 66358dfdd9a09d49d2a7e4e6a31ee47d149d6cf39452245cf89b27fddd90fff4
110 Risk Score

Malware Insights

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

The PDF sample 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 initial execution. The embedded file, named 'embedded_file_obj0001.bin', is the primary indicator of a potential secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
73d599b1bde352777f1191383e4fcf6d73999c403ef114c479cd487a9b165710		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x88 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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