Malicious PDF — malware analysis report

Static analysis result for SHA-256 16eb9e4e9838142f…

MALICIOUS

PDF

93.2 KB
MD5: 37991f84b554aa781efa09fa6e8498c7 SHA-1: ba306b3644e25d0007d574c67c4dc1146180cc38 SHA-256: 16eb9e4e9838142f833cdd14ea71d73356d874b6a44c34dce5246408f4da0a5b
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 flagged by multiple heuristics and ClamAV as malicious, specifically indicating an exploit and embedded script payload. The embedded JavaScript, though truncated, appears to be designed to execute code, likely for downloading and running a second-stage payload. The benign URLs related to XFA and Adobe are not considered malicious IOCs.

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
b476e0664fecab4e2d0421b172be5d9d623f0a7622c5a2058af277fdc319d3f8		 pdf-embedded-script PDF raw stream script payload at offset 0x246 94714 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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