Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b324cee9ae1316…

MALICIOUS

PDF

42.7 KB
MD5: dd2df89cd41e27b1724b9b9612925ef8 SHA-1: 39ff7b0a21e6c693956b6aafa3269b2dfef40b9d SHA-256: f4b324cee9ae1316b62ec3c04d5dda72e3007e519aec5ebcb89f5642b8121fb1
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36830), indicating it contains an exploit. The presence of an embedded script payload and an embedded file further supports its malicious nature. The embedded URLs, while not directly malicious, are part of the PDF structure. The exact exploit mechanism and payload delivery are not fully discernible from the provided script excerpt, but the overall pattern suggests an exploit attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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
  • 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/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
c7cb700846c9b1702a4a853af5b9007ce9694af8b32f64286341ecd10e16c04f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42996 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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