Malicious PDF — malware analysis report

Static analysis result for SHA-256 7312ba94999a5e72…

MALICIOUS

PDF

42.6 KB
MD5: 5e458cdcc7cb23a9cff8e851c86a0dcb SHA-1: 54009e61ae2c13c4375d75d2b06c04f13e8ee1f1 SHA-256: 7312ba94999a5e722a0ad328372530cac2b8686e1533acfbc069ef3aa1ec09e2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Exploit.Agent-36830. The presence of XFA forms and embedded script payloads indicates an attempt to execute JavaScript within the PDF, likely to exploit a client-side vulnerability for code execution. The embedded artifact 'embedded_file_obj0008.bin' is also flagged by ClamAV.

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
355e48d7121ef40d3811c20847fc7bbc136f5e83e75b41c2aae732733a82572b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42877 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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