Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc86b4bd5b4e2cfa…

MALICIOUS

PDF

50.8 KB
MD5: 138bfd7a02c8351a7fde27cfd85de46d SHA-1: 072c0726aec1660e78c60ec0dcbcc9530838f213 SHA-256: cc86b4bd5b4e2cfa811b2af36572c6ac533735e0fb6b4805fe0335f9ab314dad
196 Risk Score

Malware Insights

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

The PDF file exploits CVE-2010-0188, a vulnerability in Adobe Reader's handling of LibTIFF XFA images. This exploit allows for the execution of arbitrary code, indicated by the 'CVE_2010_0188' and 'PDF_XFA_SCRIPT' heuristic firings. The embedded file and ClamAV detection further confirm its malicious nature. The exact nature of the payload is not discernible from the provided data, but the exploit mechanism is clear.

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
2e736baf3ddfb63b412f1266ba8a47dcd062b2131fbd06f157cd8cd5cabfb275		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 51295 bytes

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