Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cbe42c84ba87a2…

MALICIOUS

PDF

7.1 KB
MD5: 4f3714d2f433fd1ea26c211c2c354242 SHA-1: f57aa39a4b8c6b66191053acd0525ffde81269c9 SHA-256: a4cbe42c84ba87a27c2288a053f70a958ad834ad49f1b715767dd4592a68d03f
178 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The PDF file contains embedded JavaScript and triggers the CVE-2008-2992 vulnerability via a util.printf call. This indicates the file is designed to exploit a known weakness in PDF readers to execute arbitrary code. The ClamAV detection further confirms its malicious nature. No specific family could be identified, but the exploit vector is clear.

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)
  • ClamAV: Pdf.Exploit.Agent-13121 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-13121
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000328.bin
a5e1c96913c88d606a62670d71ef876dc86939679e87d8f72059bd2c2564c33b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328 3138 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
stream_003_off0000088f.bin
f54c9430497ba53108074cc91772e946482ea3747f1c181db3350bbd5bf30a37		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x88F 400 bytes

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