Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cc438a583d3d16…

MALICIOUS

PDF

42.8 KB
MD5: cbc92f8b3924673913b37eb589978c06 SHA-1: 1c60b2f8bb9f10272c3f03de221bb73eb18dbb0b SHA-256: 37cc438a583d3d16bbda8448647d0db60d226d1245d02f49be145fd32cc9fba7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it contains exploit code. The presence of an embedded script payload and an embedded file further supports this. The embedded URLs, while not directly malicious, are associated with XFA forms which are often exploited in PDF-based attacks. The ML classifier output of 0.999995 provides high confidence in the malicious nature of the file.

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
aa4b6cb04135e8b65f36622a151abb0c92c5d956f92f3e0e5eb7bb106a6f3088		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43044 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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