Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5785b9623ca2184…

MALICIOUS

PDF

111.0 KB
MD5: 971f6d6fe3340fc00672dc872efb5668 SHA-1: fb37f58fd21e40a2842e235c10607ec103a337a9 SHA-256: a5785b9623ca2184141d33cfa7ab60d6fc3f46460444f5a0202b1c44e62eb6c9
248 Risk Score

Malware Insights

MITRE ATT&CK
T1190 Exploit Public-Facing Application

The PDF file contains an XFA form and is detected as malicious by ClamAV with the signature Pdf.Exploit.Agent-6136306-0. Static analysis indicates the exploitation of CVE-2010-0188, a known vulnerability in Adobe Reader related to XFA forms. An embedded script payload was also identified, which ClamAV further flagged as Js.Exploit.HTML-27. This suggests the PDF is designed to exploit this vulnerability to deliver a secondary malicious payload.

Heuristics 7

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains the CVE-2010-0188 exploit template: XFA JavaScript heap-spray setup, a generated TIFF image payload, and assignment of that TIFF data to an XFA image field rawValue to trigger Adobe Reader's LibTIFF parser.
  • XFA form contains executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose dataset contains a <script> or <xfa:script> block — XFA scripting has been the exploit primitive for several Adobe Reader RCEs (CVE-2010-0188 family, CVE-2018-4901, and others). Plain XFA without scripts is far less risky.
  • 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.
  • Embedded script payload in PDF stream medium 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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_00000238.bin
9999eb38330a66ce024f63c0c1ea33dc152057b079e4a44ed04d98dda28e43aa		 pdf-embedded-script PDF raw stream script payload at offset 0x238 112899 bytes
Detection
ClamAV: Js.Exploit.HTML-27
Obfuscation or payload: unlikely

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