Malicious PDF — malware analysis report

Static analysis result for SHA-256 0008d1aac96af02e…

MALICIOUS

PDF

667.6 KB Created: 2010-05-24 17:56:36 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14)
MD5: 8f17b7371d448a9b7ebe0096ab822845 SHA-1: 03d598d421a574bba9d7ef7e8d059e0aca1364c5 SHA-256: 0008d1aac96af02e9679fd7e1cc813d765760d1c614f8c81a78488fac8ebe125
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript T1204.002 Malicious File

The PDF contains embedded JavaScript that utilizes unescape functions and memory manipulation, strongly indicating an exploit. The script attempts to construct and execute shellcode, likely for downloading and running a second-stage payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8989

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 (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.
  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0055_001.js
010992f011307af659e1ffd148e873c75aa77a54b28734c4720c8bf89a249e8e		 pdf-javascript-stream PDF /JS object 55 at offset 0xA661B 1303 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
stream_000_off00000782.bin
fcb479a00bdf7c05a68b91ba89a8ea3dd2be027dcca112f1f26270c081dc3502		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x782 409280 bytes

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