Malicious PDF — malware analysis report

Static analysis result for SHA-256 86456924e1803659…

MALICIOUS

PDF

79.1 KB
MD5: dffd37e02366a06455b7b8742c1b2025 SHA-1: e4918e3184dbd48847115e97a81de656c0a46009 SHA-256: 86456924e18036592ad40a34d0351128aafd218d04a15421dfa900d7675348e4
150 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that exploits CVE-2009-4324, specifically targeting the media.newPlayer functionality. This script is designed to download a second-stage payload from the URL http://cochq.in/x/l.php?s=newp&&. The presence of shellcode download URL and the ML classifier's high confidence indicate a malicious intent to execute arbitrary code.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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. (identified after JavaScript deobfuscation)
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://cochq.in/x/l.php?s=newp&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
29bf2ec77631c52055fbd4dbae519e49b0d5e5a7903a000ebfb997a15c447a26		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 3583 bytes
javascript_obj0008_001.js
3b8548bdcdffa6efe744eaff4672d4dbe661cd61db44904465863acdbd82e56c		 pdf-javascript-stream PDF /JS object 8 at offset 0x209 80451 bytes
legacy_pdfkit_stage_000.js
38de71134fc98f3e488b5bb28eba1c79fa876b75772d9adb248908c30313de86		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x101A 2552 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
legacy_pdfkit_stage_001.js
42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414		 deobfuscated-js cross-stage annotation API aliases at offset 0x1E7 81 bytes

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