Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe3c29da1102a0b…

MALICIOUS

PDF

1.4 KB
MD5: 18eb8f15395d9ffba241d5d21048a01f SHA-1: 5b3c7512af3bd3f5661e780711bc5d57ab85b758 SHA-256: cfe3c29da1102a0b022117491547ae3b6082d33a855b815e88bfa3c199433309
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 unescape() function and the CVE-2009-4324 exploit (media.newPlayer) are critical findings, suggesting the file is designed to leverage this vulnerability to execute arbitrary code. The ClamAV detection as Pdf.Dropper.Agent-1828940 further confirms its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

Heuristics 6

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
  • ClamAV: Pdf.Dropper.Agent-1828940 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-1828940
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj111111_000.js
bd254a23093daf60257667c4cba04f39a2cf9d638f1586c779b2470c9818c027		 pdf-javascript-stream PDF /JS object 111111 at offset 0x160 1249 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
javascript_obj111112_001.js
94d48fb8b03673c3b436ebd03345cb83a0e505d7e2ec18a948e011d74403b2e3		 pdf-javascript-stream PDF /JS object 111112 at offset 0x483 252 bytes

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