Malicious PDF — malware analysis report

Static analysis result for SHA-256 2116faf62e3e86d8…

MALICIOUS

PDF

60.5 KB Created: 2012-06-11 17:19:01 Authoring application: nRy3
MD5: c9832bcf8a33d74cf352fefdac368bc4 SHA-1: c5442366c83b32c9abf5ff53baa06d826cd665ad SHA-256: 2116faf62e3e86d893486fd8125a1618d20a9ed48da84311b7f59817664ad3f5
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains an embedded XFA form with executable script, which is a known vector for exploiting vulnerabilities. Specifically, the 'CVE_2010_0188' heuristic indicates a LibTIFF XFA image exploit. ClamAV also detected this as 'Pdf.Exploit.Dropped-97'. The embedded script likely downloads and executes a second-stage payload, although the exact mechanism is obfuscated. The unknown reputation URLs are suspicious and may be related to the exploit.

Heuristics 8

  • 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.Dropped-97 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-97
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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/xd
    • http://�wX.xfa.org/schema/xfa-template/2.2/
    • http://�wl.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off00000323.bin
a7046bc6a91256bc36caf7fab57a5d7f53b7f42294282b30aead307636c1dd9c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x323 60267 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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