Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c68121490734324…

MALICIOUS

PDF

6.1 KB
MD5: 2043128d31d95f769e7872f4e600edf8 SHA-1: 80d70fe286cdffb53f9ddb4583f60de6befa4265 SHA-256: 7c68121490734324deaec185efede7c9878691904774a446375cf9c45062ba98
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript and triggers a heuristic for CVE-2008-2992, indicating exploitation of a vulnerability to execute code. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although its exact function is obscured by the PDF structure. The benign URLs present do not detract from the malicious nature indicated by the exploit and script.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 4

  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000452.js
7ae9a32e079e696720dd17bf9878cfe7efb347d909b28eb33fe312955f57885f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x452 561 bytes

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