Malicious PDF — malware analysis report

Static analysis result for SHA-256 835d1977a53d557b…

MALICIOUS

PDF

6.1 KB
MD5: 635f6f65283c78401c739de021ac5136 SHA-1: d86085e2820d8e1294d843be2fb70405323ef696 SHA-256: 835d1977a53d557b4363f89fae13b677c563046736dfea5f544abbd08567c6f7
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript and triggers a critical heuristic for CVE-2008-2992 (util.printf). This indicates the file is designed to exploit this vulnerability to execute arbitrary code. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for malware delivery.

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_off00000451.bin
399100bbc5b62a65f852f2eee512e535aa6fae338cfe1f3cf3f8eb38f9da0fca		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x451 495 bytes

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