Malicious PDF — malware analysis report

Static analysis result for SHA-256 1998b6399f438de9…

MALICIOUS

PDF

204.9 KB
MD5: cfb6a1505272feaf9a0bbee5c7807568 SHA-1: e9b63e177975998e8f592a8e25b219aa05148357 SHA-256: 1998b6399f438de9e3c3ff93a4613e2df15fb1939b704d13f8a5d481f0f32306
150 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability to execute code. This script is designed to download a secondary payload from the URL http://splo.in/she/p.php?e=8&&. The ML classifier strongly indicates maliciousness, and the presence of shellcode download functionality confirms a multi-stage attack.

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://splo.in/she/p.php?e=8&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
9599829950288d33abcdd9f80c866a8316372c1bbb9f2868222f69010b4f5a96		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2780 bytes
javascript_obj0008_001.js
7b81e6aea001441571a3aae05d1e088f0f1231705085aab865b65c7701af40e1		 pdf-javascript-stream PDF /JS object 8 at offset 0x209 209315 bytes
legacy_pdfkit_stage_000.js
463a1e20920870507a5f509e74ee70cc639e2685f7c37c1f5caf37dd7b679f67		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xCF7 2546 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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