Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afd228bdbfa694c…

MALICIOUS

PDF

92.8 KB
MD5: c60e131ad78c52ee0b756dd7c0245904 SHA-1: 6c17d6c272ff789aaf0b8d7bc4ad2a62238f5cd4 SHA-256: 6afd228bdbfa694cbabac008aaba00b24e780bcace37412ec9c799cc48c35f1f
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 to download a payload from the URL http://bestsunstar.com/sss/p.php?e=8&&. The JavaScript is obfuscated but appears to be responsible for initiating the download and execution of a second-stage artifact, as indicated by the 'SHELLCODE_DOWNLOAD_URL' heuristic.

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
5a9df6b9b99aa1bebfc895dd0b4e00785067bf167661643acb55a98d0d84d128		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2578 bytes
javascript_obj0008_001.js
7849b48e464798075bd44664f127f7b6c1fa13223acd51b09c6b9e06a53eb46f		 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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