Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c0c8adf6ff0685…

MALICIOUS

PDF

14.4 KB
MD5: b98e8c92af57fb8fa077e3145a792b89 SHA-1: 0addc013f85be1054d0a16271bbb09f285f47d39 SHA-256: f5c0c8adf6ff0685a938a1d927f592cc95fd433815f9046b9d8d5ee386bf24d9
170 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The sample is a PDF file that leverages the CVE-2010-0188 vulnerability in Adobe Reader's XFA processing. The embedded XFA numeric stager and the ClamAV detection of Js.Exploit.HTML-30 indicate that the exploit likely attempts to download and execute a secondary payload. The reconstructed document body string 'app)ar=qwe123ba.rawValue.subsbt(3).replace(/z/g,\'1\').replace(/w/g,\'2\').replace(/a/g,\'3\')' suggests obfuscated JavaScript or similar scripting is present, further supporting the exploit's intent to compromise the user's system.

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.
  • ClamAV: Js.Exploit.HTML-30 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Js.Exploit.HTML-30
  • XFA numeric character-table eval stager high PDF_XFA_NUMERIC_EVAL_STAGER
    PDF XFA initialize script reads numeric form data from rawValue, maps the values through a short character table, and evals the reconstructed stage. This is an exploit-kit staging technique even when the final decoded layer remains encoded.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.xfa.org/schema/xfa-template/2.5/

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