Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d78cd94ac04f4ad…

MALICIOUS

PDF

1.4 KB
MD5: 1c5dff0461b6bfb74ffdae631709d098 SHA-1: 8f3c272c71721b4e85031fc6c476d944f7193f44 SHA-256: 4d78cd94ac04f4ad068e927aaed7c4494beac2f15605e48e32403960abe7f300
118 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious JavaScript T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains multiple embedded JavaScript streams. The critical heuristic firing for CVE-2009-4324 indicates the file exploits a known vulnerability in Adobe Reader's media player functionality. The embedded JavaScript, particularly the unescaped stream, is likely responsible for downloading and executing a secondary payload. The presence of obfuscated JavaScript further supports this conclusion.

Heuristics 5

  • 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)
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj111711_000.js
ed214d008ca7f8fad0affc792159f2b30ce479dc90c5348e0751937c74ebe0c2		 pdf-javascript-stream PDF /JS object 111711 at offset 0x197 291 bytes
javascript_obj111712_001.js
8fa07938ee1332e6ed874266f25bda26855e88d28a8f03f82478bbf0125da56d		 pdf-javascript-stream PDF /JS object 111712 at offset 0x2B2 966 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj111713_002.js
d2f98bec78aa096efa5aca99b701d5e6b9a8e2cf728fb7e79bf248862bacf14b		 pdf-javascript-stream PDF /JS object 111713 at offset 0x511 70 bytes

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