Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18ef3a9b9d4737b…

MALICIOUS

PDF

100.0 KB
MD5: 56086b6c7f2f9e06a72110d34e7a1879 SHA-1: 90aa20a6919ee9b3a9cd91081738df2ab51de64e SHA-256: b18ef3a9b9d4737b80b54647bb49583a6470285451faa1c2ae75c52f977f2bf8
136 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious PDF T1059.001 Command and Scripting Interpreter: PowerShell

The sample is a PDF file that exploits CVE-2010-0188 in Adobe Reader via XFA forms. The embedded script payload is likely responsible for executing the exploit. The script itself is heavily obfuscated, making it difficult to determine its exact function, but it is highly probable that it downloads and executes a second-stage payload. The presence of XFA forms and embedded scripts are common delivery mechanisms for exploits.

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.
  • 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.
  • 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
565e4776f2d30e68f90020544afb678d394134a4bf25827da2f6409576840462		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 101648 bytes

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