Malicious PDF — malware analysis report

Static analysis result for SHA-256 277ca7082c3d817c…

MALICIOUS

PDF

42.5 KB
MD5: 39fcffb5d791901597852e4d9dbdd170 SHA-1: 5f9f29d3123cd4854a651fcfd96f07a03f23515d SHA-256: 277ca7082c3d817c256dd7bc3180c334ef1213ba1cc94b2d2461283d48c4e773
186 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. The presence of an embedded script payload and an embedded file suggests the document is designed to exploit a PDF vulnerability and deliver a secondary payload. The embedded file 'embedded_file_obj0008.bin' is the primary artifact of interest.

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
1c5b84547f9ca6267cb397eb2c70aef41b41bd8dbd87ec9badd8b46b8a6cb804		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42720 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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