Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba5026b9f55b6ef…

MALICIOUS

PDF

3.5 KB
MD5: 40587b95236f6e1bb93f7a56b72f219f SHA-1: e6f221e938b6e380b1de717a4a5053e843b83a22 SHA-256: 5ba5026b9f55b6ef85dec0d34e610b463d316364126dc42192db901fc258b351
370 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, specifically targeting the media.newPlayer functionality. The JavaScript is designed to download a second-stage payload from the URL http://67.69.148.219/index.php?arch=i386&os=windows&version=unknown&c=um26HD2U&t=7413519c137c4c9e&random=104406443, as indicated by high-severity heuristic firings. This behavior strongly suggests the PDF is a dropper for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 10

  • 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. (matched in decompressed stream)
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Js.Exploit.Shellcode-18 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Js.Exploit.Shellcode-18
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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://67.69.148.219/index.php?arch=i386&os=windows&version=unknown&c=um26HD2U&t=7413519c137c4c9e&random=104406443

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_001.js
ee0ee83c00f35ea3ac4a87d58dc84c96650acad1202ffa735aea8f168643e203		 pdf-javascript-stream PDF /JS object 8 at offset 0x193 8085 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
combined_document_js_000.js
0eb39146a85635785b8f47cf1c095b2525677befb40105325a75b8057c8248fb		 deobfuscated-js combined document JavaScript streams at offset 0x16A 8088 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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