Malicious PDF — malware analysis report

Static analysis result for SHA-256 008e5f3b15ca94e8…

MALICIOUS

PDF

92.8 KB
MD5: f4dd634f2903b1cb3ac5d0169d59c7b5 SHA-1: 0938bd12616c6d48188f03bce6c487de2e897193 SHA-256: 008e5f3b15ca94e84f40edf7dfa997df445a0ed180100ce979c4ddb8628321e6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript that exploits CVE-2009-4324 using the media.newPlayer vulnerability. The script is designed to download a second-stage payload from the URL http://bestsunstar.com/sss/p.php?e=8&&. The ML classifier strongly indicates maliciousness, and the embedded URL is a critical indicator.

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://bestsunstar.com/sss/p.php?e=8&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
66b1a765912b25fb7d2308c5cd54b0173d3505905cba061d9b1ce5f03603b28e		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2578 bytes
javascript_obj0008_001.js
66f4fdd34e4e46b04f1093615d714282962ca76474155d161f2389cc0e440b30		 pdf-javascript-stream PDF /JS object 8 at offset 0x209 94542 bytes
legacy_pdfkit_stage_000.js
ada8be7fcbbba2749cefe5122fc7e86dce72eb1b6eeddf6c5a324ca92ef02182		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xC2D 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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