Malicious PDF — malware analysis report

Static analysis result for SHA-256 096fd0ba08537197…

MALICIOUS

PDF

7.1 KB
MD5: 70d1eddc123f6698008cab8acd5d2e0d SHA-1: fee6fa12094287c3d9e84b4bc44cab59005bfc6f SHA-256: 096fd0ba08537197b9f255f4e6aabe323c4be7e276785320003601c6fd4ccc7c
150 Risk Score

Malware Insights

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

The PDF sample contains obfuscated JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics, and a critical PDF_JS_EXPLOIT_CLUSTER finding. The JavaScript stream, specifically stream_003_off00000827.bin, likely contains code to exploit a client vulnerability and download a secondary payload. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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_002_off00000327.bin
03d26ba1db3af23b74445081cc81e8162352d516c074210aaf1c4ef1ce184363		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2321 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_off00000827.bin
126f6476da3acfc7827c7fc8a4b11554e95366eb365649421f7364925b320224		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x827 442 bytes

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