Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8826a1d57bff9e…

MALICIOUS

PDF

79.0 KB
MD5: 707dfae8fa2b86425d93e42df4c89773 SHA-1: 007c1b60aa9d25362a4ec5cce3901d9dfc377c18 SHA-256: 6b8826a1d57bff9ea8312c6be80d48635ad1e6b537fc6b1643563118bac85afb
168 Risk Score

Malware Insights

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

The PDF file contains an XFA form and an embedded JavaScript payload, flagged by multiple heuristics and ClamAV as malicious. The embedded script, although obfuscated, appears to be designed to download and execute a secondary payload. The benign URLs extracted are likely unrelated to the malicious functionality.

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_0000023c.bin
0464feea18b7f2ef1dc30a6ebd7fabc3884d1d3deeeb9cad3b8c0c5fbd4dee2b		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 80195 bytes
Detection
ClamAV: Js.Exploit.HTML-29
Obfuscation or payload: unlikely

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