Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6b913c98e598b4…

MALICIOUS

PDF

101.9 KB
MD5: 3d3b6527c83c7acbca8ad999a5b7c53d SHA-1: 8cd259fd67ee06383217b8bc66b2bbc30ac2a66d SHA-256: 0c6b913c98e598b4036f66b22f0c46ce259e5af774215410ede317f3a93af8fe
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. This script is designed to download a second-stage payload from the URL http://wordpresscashsecrets.com/cancershape/and/p.php?e=8&&. The ML classifier strongly indicates maliciousness, and the presence of a known exploit points to a malicious intent.

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://wordpresscashsecrets.com/cancershape/and/p.php?e=8&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
287bca7cb91aa264233327cbf42c176758e96d273b3973d1aa9cda1681241f14		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2578 bytes
javascript_obj0008_001.js
4dc64244b17224f9a715f92a4789bf0bdd4475119be504e25ed70648a5957bb2		 pdf-javascript-stream PDF /JS object 8 at offset 0x209 103831 bytes
legacy_pdfkit_stage_000.js
5696eede220c60b3123817fcfba8a93ae510a2fbbd62709e5da58b96bb20a88a		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xC2D 2804 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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