Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac1fb205f138e27…

MALICIOUS

PDF

42.3 KB
MD5: 6aa6270620a7c21d01f353dddac73e67 SHA-1: 888627a0ce95930f1a3b7d1aea0e6ebd57524fb1 SHA-256: 4ac1fb205f138e2711950fad851babd1bf9b08aadbbf1d96235d7e8d17b3b1a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The critical ClamAV detection and the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic indicate that this PDF file contains and likely exploits a known vulnerability to deliver a malicious payload. The embedded artifact, named 'embedded_file_obj0008.bin', is also flagged by ClamAV with the same signature, suggesting it is the primary malicious component. The XFA form and embedded URL heuristics are less critical but contribute to the overall suspicious nature of the document structure.

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
66a92d0c6b5478d93ccf443ac54897c1520e2907ef0aa53d5485403e0f1f502e		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42592 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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