Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c0d459531ceb94…

MALICIOUS

PDF

7.1 KB
MD5: 69f5421b9b2e63144ba060343cd875d6 SHA-1: 7a38c715275234e00708c75ebe40f4efd5e9c167 SHA-256: 76c0d459531ceb949e096491450f9a79167b6de39caa47eefe321e21a8c058de
210 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages the CVE-2008-2992 vulnerability, indicated by the 'util.printf' function. This vulnerability allows for the execution of arbitrary JavaScript, which is a common technique for delivering further malicious payloads. No specific malware family could be identified from the available evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

Heuristics 7

  • 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)
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded 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)
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000329.js
989c4a5e702ceee455e4c0212c4f6df011bf5d5b46f1267c8ab18c1b7bafb400		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329 450 bytes
stream_003_off00000495.bin
e15edabd83c4cc3be07722f938b4e02a971b584a316b6c0555e637dfea5353a0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x495 2332 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s).
stream_004_off0000080a.js
2e2db326bf3a7c4f34338f1001d3d60ecebd7534ecacdfebdfa0242d5f6ad415		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x80A 584 bytes

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