Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52c03017bd39ecc…

MALICIOUS

PDF

6.8 KB
MD5: d97105ce0ea2ea5163e79cb10500ca58 SHA-1: f2c97b36aad80c51d8668bf3dce54341a36d71c6 SHA-256: f52c03017bd39ecc48eb1598db1dc6122af756656cd040c393f561180e93d665
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 strongly flagged this PDF as malicious. The presence of unescape() calls and obfuscated script content suggests the JavaScript is designed to download and execute a second-stage payload. No specific family could be identified due to the obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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_002_off00000327.bin
e5e79b06bd12ffb0eacad426c37da628e4cba4d5b7cd11547398337987531bd1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 1477 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_003_off00000715.bin
475ae7a76b1ba9bd56d03bc1c0e6e2dd51ec82c454956b01e1a3538a22042e78		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x715 442 bytes

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