Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf5efdb283b907a…

MALICIOUS

PDF

12.9 KB
MD5: 1281cdccf744699e8db35eec27773102 SHA-1: 095d76ad1c0bfe89226a264a6603f5351e85b6ae SHA-256: abf5efdb283b907a39fed2041c45099c9c61fbfc6c8f565701b122d01ffbc9b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The PDF file contains an embedded script payload and exploits CVE-2010-0188, a known vulnerability in Adobe Reader related to LibTIFF XFA image processing. The ML classifier strongly indicates maliciousness. The embedded script, though obfuscated, appears to be responsible for downloading and executing a second-stage payload. The reconstructed string 'String.fromCharCode.valueOf(' suggests JavaScript execution for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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_obj0009.bin
6c777e7622c07d1507c27e04d397bd49b936a094cb168af6babab62cb37c26ad		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0xD5 12469 bytes

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