Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ce14556db4101d…

MALICIOUS

PDF

6.9 KB
MD5: 8a6d6c7f6c69bf43e8fcfa08c114bcba SHA-1: 623bbf78701a4362a4ee9374289f31022a6a9de8 SHA-256: 62ce14556db4101dbf90245f8f92d48111b8130a8b99436261ac8b3bc14b31be
150 Risk Score

Malware Insights

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

The PDF file contains JavaScript code that is heavily obfuscated and utilizes the unescape() function, indicating an attempt to exploit a vulnerability. The ML classifier also flagged this PDF as malicious. The presence of JavaScript and exploit cluster heuristics strongly suggests the execution of malicious code, likely to download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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. (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_003_off00000425.bin
129095e77dae61c01c0dfd12bb23ace69bd75dc9cb819e66fd846035891910d2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x425 1103 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
stream_004_off00000780.bin
28bed08a94bcfaf2599d133a33cb65561dab3c8c0b506b0d96bdeb2edae030f7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x780 485 bytes

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