Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c96d56a91e22ad…

MALICIOUS

PDF

79.1 KB
MD5: becced6ee47d8ab8a5360b915c999403 SHA-1: 6c9016e6fe71afe75ff0586f6a1d3619d972dfcf SHA-256: 07c96d56a91e22addf2418191b6363fc6bbd158d7bb2c0bc68fb42e00577dd77
150 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-4324 via the media.newPlayer API. This script is designed to download a second-stage payload from the URL http://tyfaw.in/x/l.php?s=newp&&. 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://tyfaw.in/x/l.php?s=newp&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
6585ea29fc1584c331a38a6d074ca55339f4530861df6c9bc6dd8e1361bd0433		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 3583 bytes
javascript_obj0008_001.js
fe4c21364d6d758bee448b0d4880490c33f4581ad821267b137b7d5034304250		 pdf-javascript-stream PDF /JS object 8 at offset 0x209 80451 bytes
legacy_pdfkit_stage_000.js
45b32239c76897787145f34b324ce5bc925d33cfc1639da99f21711c7c9cf5cc		 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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