Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e17668fc1fda86…

MALICIOUS

PDF

11.8 KB
MD5: 92481f8deb6eea07616d1e7d5618ccc4 SHA-1: f2947fbf5a3d8dc0aa516e91c861bbae478b784c SHA-256: 37e17668fc1fda86a650386c0f87b6a2a115289fc873142c043df4fc2e9e2f33
196 Risk Score

Malware Insights

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

The sample is a PDF document that exploits CVE-2010-0188, a vulnerability in Adobe Reader related to XFA forms and LibTIFF processing. The critical heuristic firings for CVE_2010_0188 and PDF_XFA_SCRIPT indicate that the document contains an embedded script payload designed to be executed by a vulnerable version of Adobe Reader. The ClamAV detection further confirms its malicious nature as Pdf.Exploit.Dropped-78. The embedded file and script suggest a downloader or dropper functionality.

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
ebe969c28d2df8a8add44bbf7894d1458addfe2b0f9bd78c861cd69767a73c63		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11304 bytes

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