Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c71ea81ec6677ba…

MALICIOUS

PDF

94.1 KB
MD5: a5798ee88f690c1b29b32a41ecaaee95 SHA-1: 0560aab6c587b2dc6bdd34e00799e9ed8b86c4a0 SHA-256: 5c71ea81ec6677ba8b9f21e9111256e36b87ccb41b4f208da76e4815fce2c897
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 multiple heuristics and a machine learning classifier. It contains an embedded XFA form and JavaScript payload. The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload, indicated by the ClamAV detection names referencing exploits and agents. The embedded URLs are benign and related to XFA schema.

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
f80ead500cb5561a203b18f50de9da4a9841321d1d5729a2a8996a3f1750f9cc		 pdf-embedded-script PDF raw stream script payload at offset 0x246 95638 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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