Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14e5475a0b55e6d…

MALICIOUS

PDF

1.24 MB Created: 2010-07-29 10:29:13 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)
MD5: dd2f50de5ab46d133267869548e96d45 SHA-1: 350d8009182be29d1f70c8b78a5a53dbb383d8e0 SHA-256: c14e5475a0b55e6de32eb2a3b9dd02e151880b7ad4df43078202fe8c846b0776
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier also flagged the PDF as malicious. The presence of unescape() calls and the extracted javascript_obj0055_001.js artifact suggest the script is likely obfuscated and intended to perform malicious actions, such as downloading a second-stage payload. The exact intent is difficult to determine due to obfuscation, lowering confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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
3ae9f60d0e691b0784ce962821006bf71f8831d55a868aeb909a8d66caea548e		 pdf-javascript-stream PDF /JS object 55 at offset 0x13DBAE 1290 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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