Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb891ea42824a2a9…

MALICIOUS

PDF

4.1 KB
MD5: 6bf98350d3290e03c27740b993981bc4 SHA-1: 8e511b45463bf3839fd6989a1a05f3aa174257e8 SHA-256: fb891ea42824a2a97dc745b90cc8aba089f3d432da04f82f5f48ae5f53b84b55
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. A critical heuristic identified the CVE-2008-2992 exploit, which leverages util.printf to execute code. The embedded JavaScript is likely designed to download and execute a second-stage payload, although the exact functionality is obscured. The ClamAV detection further supports the malicious nature of the file.

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)
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0006_000.js
9e972b0e617973af7637acf61ac7ef0a23f907d7965ab6a028ed475eb25df4d4		 pdf-javascript-stream PDF /JS object 6 at offset 0x195 2844 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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