Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1ff36eea78d353…

MALICIOUS

PDF

7.1 KB
MD5: 7772bde91c0a40732b27273bbe8565b7 SHA-1: 2b637f67171f72a7e8acd174054736c09024acff SHA-256: 9c1ff36eea78d353ae059b0de6b20506bfd69fdda0a4360bbb751de5cc1e4b37
118 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and triggers the CVE-2008-2992 vulnerability via a util.printf call. The JavaScript is obfuscated, but the presence of unescape() and the exploit itself strongly suggest it's designed to download and execute a second-stage payload. No specific family could be identified due to the generic nature of the exploit and obfuscation.

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. (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
682b511396377fcffea568f9296bd3c17ba631e1d19746f2025c4678b7982123		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x329 623 bytes
stream_003_off00000492.bin
61bfb6460e03cb22de1eb306e7069e9283fd16c3b264800c1551a71331eb9ca1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x492 2472 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
stream_004_off00000829.js
8622d4668dc2c019c597a41e85f5a77365118e5a1f16a6f2bb89ca85aa2d509c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x829 612 bytes

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