Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf806707690d0cb…

MALICIOUS

PDF

7.0 KB
MD5: c1a10b2a7394a6ea202234cd2a4010ad SHA-1: 90be468a51a9a2399e49b3580e1eab5a49551b2d SHA-256: fcf806707690d0cbc6cdf9506770d08c55e93a3a8473fb13a5c5793178c133c2
178 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 presence of a CVE-2008-2992 exploit (util.printf) and the ClamAV detection as Pdf.Dropper.Agent-7328141-0 strongly suggest this is a malicious dropper. The unescape() call further points to obfuscated JavaScript, which is likely used to download and execute a secondary payload.

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: Pdf.Dropper.Agent-7328141-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7328141-0
  • 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
60caa8010ad3bca8e777f4a4d753ed1d11b69ec935e775fdbb62797d8a5598e0		 pdf-javascript-stream PDF /JS object 6 at offset 0x1A5 6089 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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