Malicious PDF — malware analysis report

Static analysis result for SHA-256 808352921c2c091d…

MALICIOUS

PDF

94.2 KB
MD5: f3636be92245f67d972685f520cd0ffa SHA-1: 5d80100bd5be0de931da903a8b178ba69595d197 SHA-256: 808352921c2c091d3175c527269bd8ec3f4e3c0c9bb8d68341f4abadb9a26b47
168 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier, indicating an exploit. It contains embedded JavaScript within an XFA form, which is a common technique for executing malicious code. The script appears to be obfuscated but likely attempts to download and execute a secondary payload, as suggested by the embedded script payload heuristic and the ClamAV detection names.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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.
  • 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_pdf_script_00000246.bin
164fbe11a9cd77260a9689fb7c8fde1d6acec9e396c099fec34070ef8729dda7		 pdf-embedded-script PDF raw stream script payload at offset 0x246 95742 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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