Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c2db36c9c17160…

MALICIOUS

PDF

86.7 KB
MD5: f8d0d3f9e96e58065bd6045bb14d143e SHA-1: 66216e2a121d0706096b7e25238840f9f959ac5b SHA-256: 23c2db36c9c17160414fc28b4be03b4e86e59167f7314e6a0548c0e80f495c1b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1204 User Execution

This PDF file exploits the CVE-2010-0188 vulnerability in Adobe Reader's handling of XFA forms. The critical heuristic firing for CVE-2010-0188, along with the PDF_XFA_SCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD firings, strongly indicate that the document is designed to deliver a malicious payload. The ClamAV detection further confirms its malicious nature. The embedded file is likely the 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.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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.
  • 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 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
eacde81d812b6fa5f4234bb0392dbf19274419e469dce47821a0c0cdcfd2c51d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 88014 bytes

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