Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef02a1586949825…

MALICIOUS

PDF

46.2 KB
MD5: 9907e4d3b732f26a46b0363c6c889be2 SHA-1: 0540e55c1fd26b2a9ac5e7c2511fa8bf2b6edca9 SHA-256: 5ef02a1586949825f35c0f64a64c5ac33bfe469778ee5ab8943337430bc4fb9d
210 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. The JavaScript is designed to download a second-stage payload from the URL http://splo.in/x/p.php?e=8&&. This indicates a malicious document attempting to execute arbitrary code and download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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)
  • ClamAV: Pdf.Exploit.Agent-19222 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-19222
  • 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://splo.in/x/p.php?e=8&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
ea331d4c70f73822d7937eeab648c6e6714287f15c2801044964d8716bd32776		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2578 bytes
javascript_obj0008_001.js
b58c7d5be3e23b6deff730ad89bc76babf200a2dd44561349c2c930665e550ed		 pdf-javascript-stream PDF /JS object 8 at offset 0x209 46806 bytes
legacy_pdfkit_stage_000.js
d7155f873b59e589a73c704be477a30cf4921d43cb2c81abc4b0960cad6f3280		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xC2D 1220 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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