Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9af3a8daefec97…

MALICIOUS

PDF

1.25 MB Created: 2010-07-29 11:39:29 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)
MD5: 0e50b1b3067be2bab8bc3c7186c6c308 SHA-1: e0c7cdcb74bf593bf51ab27e6d01f5068c538ea6 SHA-256: 5a9af3a8daefec971565d76645a8af2e43e9b26e506ccf95c1032e0bee7f444c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript streams that are heavily obfuscated and trigger exploit cluster heuristics, including an unescape() call. This indicates the script is designed to exploit a vulnerability within the PDF reader to execute arbitrary code. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact URL is not directly discernible due to obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 6

  • 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
  • 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://www.monotype.comMonotype
    • http://ocsp.verisign.com/ocsp/status0
    • https://www.verisign.com/rpa0
    • http://www.monotype.com/html/mtname/ms_timesnewroman.htmlhttp://www.monotype.com/html/mtname/ms_welcome.htmlhttp://www.monotype.com/html/type/license.html
    • https://www.verisign.com/rpa
    • http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0
    • http://www.microsoft.com/typography
    • http://www.iec.ch

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0055_001.js
a94fc7173a135c95e90fc3214941ea0cf06c2c12f8d33a94938ce3e6de205cec		 pdf-javascript-stream PDF /JS object 55 at offset 0x13DBAE 10292 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0055_002.js
0b4821d70d524e0a52ccf74dd6490f42fe6b78a7ce65a4b4d696dc64bff6d2f3		 pdf-javascript-stream PDF /JS object 55 at offset 0x13DBD2 11785 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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