Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f60f566809a1b1…

MALICIOUS

PDF

6.1 KB Created: 2010-02-19 14:37:56 +03:00
MD5: a686e64995cfa6ccff6b3ece153c1453 SHA-1: e89378b2baf1b8ab5c8674bd80d5b5a817ca0a9e SHA-256: b8f60f566809a1b1bbbefbc6635ed767d5c5ebd017c860c75e62d96d65f5f834
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2008_2992 heuristic firing suggests the exploitation of a known vulnerability in PDF parsers. The embedded JavaScript stream, identified as 'javascript_obj111111_000.js', likely contains malicious code designed to download and execute a second-stage payload, as suggested by the 'Suspicious extracted artifact' heuristic. The unescape() call further points to obfuscation techniques commonly used in malicious scripts.

Heuristics 6

  • 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)
  • 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.
  • 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.
  • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj111111_000.js
ff572f71a94598debc7adf170ff917035cccae2c3e3f3b272a7b7dc6ffe45299		 pdf-javascript-stream PDF /JS object 111111 at offset 0x1C9 2462 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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