Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef76cbdaa211331c…

MALICIOUS

PDF

6.2 KB
MD5: a3fd5728a177ec419ece3623902a00a1 SHA-1: 0269e600015a790c564a97293cf42a892b8bb9a5 SHA-256: ef76cbdaa211331c87043d4e0c7da300b34f77d399e56d90d37e162887bf6bfd
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes the unescape() function and a printf() call, indicating exploitation of the CVE-2008-2992 vulnerability. The ClamAV detection 'Pdf.Dropper.Agent-7321864-0' further confirms its malicious nature. The primary function of the embedded script appears to be downloading and executing a second-stage payload, as suggested by the heuristic firings and the nature of dropper malware.

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-7321864-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7321864-0
  • 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
d7b0ffdfde073eb22cb7f10b7b4d1eeadf44a55cfc209cdb04ceb1bc7a1a90ae		 pdf-javascript-stream PDF /JS object 6 at offset 0x1B9 5379 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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