Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c7e3b99fcd12e9…

MALICIOUS

PDF

122.8 KB
MD5: 2bf357b4f9076ed054a69a2dc6e6ebb3 SHA-1: df78830688f4c22eed968ff7238ee04242b465bc SHA-256: 18c7e3b99fcd12e92a897b98888d6205100c2fab26172bf86326f31d3c970f10
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It exploits CVE-2010-0188, a vulnerability in Adobe Reader related to LibTIFF and XFA forms, to achieve code execution. The embedded file and XFA payload indicate the primary function is to exploit this vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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
  • 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_file_obj0008.bin
742c455e4cd77f7985a79c8f960bd3c92e4da460de6e6c96a35b887add529090		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 124995 bytes

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