Malicious PDF — malware analysis report

Static analysis result for SHA-256 81698cabaed22354…

MALICIOUS

PDF

111.4 KB
MD5: 0aaec5c875dcb1e5fd494d1003a5cc77 SHA-1: d0c292e2bee7f93c1eb1e4a469b030ef50cf82a2 SHA-256: 81698cabaed223545cde0e499c0546ac99c40c4f105099a4e17912122115ce4e
248 Risk Score

Malware Insights

The file is a PDF document that leverages the CVE-2010-0188 vulnerability in Adobe Reader's XFA forms to execute a malicious script. This script is detected by ClamAV as 'Pdf.Exploit.Agent-6136306-0' and an extracted artifact is also detected as 'Js.Exploit.HTML-27'. The embedded script likely downloads and executes a second-stage 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
967ae4e5e331c7f2453e5297746a82bf243a479e6a32c2ce43bde975e04ac6c8		 pdf-embedded-script PDF raw stream script payload at offset 0x238 113391 bytes
Detection
ClamAV: Js.Exploit.HTML-27
Obfuscation or payload: unlikely

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