Malicious PDF — malware analysis report

Static analysis result for SHA-256 180187c4926d523f…

MALICIOUS

PDF

42.5 KB
MD5: 1cb2257d999ab1177b771193ebcac935 SHA-1: 873b535450d8e3325ac442eb1c9e6e1f3af77854 SHA-256: 180187c4926d523f164bd0e8561886c13f6c31ad652d5abb1f62b00cd0597473
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as 'Pdf.Exploit.Agent-36830'. The presence of an embedded script payload and an embedded file indicates an attempt to exploit vulnerabilities within the PDF reader to execute malicious code. The benign URLs present are likely decoys or standard PDF form-related resources.

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 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 script payload in PDF stream low 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 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
fdf23b43f9d4d027abd8e3a0866defa1b8c7d233377caaefc4daa4451a8602a4		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42762 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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