Malicious PDF — malware analysis report

Static analysis result for SHA-256 701a90bc9cf8fc21…

MALICIOUS

PDF

80.3 KB
MD5: ef88e00e8d50f4eaac7335e1af5db04c SHA-1: 9e6ae50621156e6ff7227c8a4e57f1908d24b29d SHA-256: 701a90bc9cf8fc213c59bd65ce9795c323757c9933378cf4bd28e34bf7622835
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 using the media.newPlayer annotation. The JavaScript is obfuscated but appears to contain logic to download a second-stage payload from the URL http://nseleonore.ru/x/l.php?s=newp&&. This indicates a malicious document designed to execute arbitrary code.

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://nseleonore.ru/x/l.php?s=newp&&

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
a01dc10db5992be0616d4b5a6d555cb00a8d4dc2c1f4a53a6d91fd53a47de310		 pdf-javascript-stream PDF /JS object 8 at offset 0x217 3783 bytes
javascript_obj0008_001.js
1fef02dd4ebbaf94d91242e5649f2aeffce1b9c3f39a530f462cc77820c70370		 pdf-javascript-stream PDF /JS object 8 at offset 0x23E 81701 bytes
legacy_pdfkit_stage_000.js
d25d4c802e488a26bbca7ee7d2ca95e2dd1a9063dd746985326737a9e7fcc802		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x111A 2586 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 0x217 81 bytes

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