Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bfe2874551183e…

MALICIOUS

PDF

1.25 MB Created: 2010-07-29 11:36:34 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)
MD5: dae9473fb0e7b8983d1eb4b00ab1c7ca SHA-1: b9621265688be3f10da39a05745ddc469a6b0535 SHA-256: b4bfe2874551183e24de9a1d92ede5b05f9b10c16976f7d70c3c62ef4ea06b3b
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream, named 'javascript_obj0055_001.js', is likely responsible for downloading and executing a secondary payload. The presence of PDF_JAVASCRIPT and PDF_JS heuristics further supports this. The unescape() call suggests obfuscation within the script.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 5

  • 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://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://ocsp.verisign.com/ocsp/status0
    • https://www.verisign.com/rpa0
    • http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0
    • http://www.microsoft.com/typography
    • http://www.iec.ch

Extracted artifacts 1

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).

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