Malicious PDF — malware analysis report

Static analysis result for SHA-256 61612bc74f5d269a…

MALICIOUS

PDF

7.0 KB
MD5: 36de7d5d6d6051e185732423af2c2291 SHA-1: c526a8a832746deadaebdb4153e7f410cdb534a7 SHA-256: 61612bc74f5d269aadce3ab0dd3bca13086748c2972c5d0da1fdce63be352274
210 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that is obfuscated and utilizes the `unescape()` function, indicating malicious intent. Critical heuristics identify the use of `media.newPlayer` which is associated with CVE-2009-4324, a known vulnerability for client execution. The ML classifier also strongly flags this PDF as malicious. The primary attack vector appears to be exploiting this vulnerability to run arbitrary JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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. (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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000327.bin
e562bfbbb8ffb50a07b78b8ae8b7b4e48b8d71279a178ea04bd403905dad6b16		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2212 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
objstm_0024_00.bin
192d5f0e1735baf246602efc2ad4d94ffdd1d59ce900b27a8df433cbe596dccd		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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