Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6c35a29151bc31…

MALICIOUS

PDF

111.0 KB
MD5: c3583152405dfd5f4a32651da46505d3 SHA-1: a239192903153f42dd7be8bf71a9f64ea39bf4c2 SHA-256: 3f6c35a29151bc31661083eccc454c96d14e1b6101680d08d54b5f5e629c822e
248 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1559.001 Component Object Model Hijacking: DLL Side-Loading T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file is identified as malicious due to the presence of an XFA form containing an embedded script payload. The critical heuristic firing for CVE-2010-0188 indicates exploitation of a known Adobe Reader vulnerability, specifically related to LibTIFF XFA image handling. The embedded script, detected by ClamAV as Pdf.Exploit.Agent-6136306-0 and its extracted artifact as Js.Exploit.HTML-27, likely serves to download and execute a second-stage payload. The embedded URLs, while mostly benign or unknown, are associated with the XFA structure.

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
df4ccc28ca4f94eda5f6645890f6fe65a278c37c9e63c66ccb285689d797ec33		 pdf-embedded-script PDF raw stream script payload at offset 0x238 112901 bytes
Detection
ClamAV: Js.Exploit.HTML-27
Obfuscation or payload: unlikely

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