Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d695fc1ed36a20e…

MALICIOUS

PDF

7.0 KB
MD5: a671fce2eee7c01996851aea012f3b9c SHA-1: 8c9c1901afdb11515fa2ff92e705a7607b74679a SHA-256: 0d695fc1ed36a20eff817a6e89adcc20a499fad92401370b89af785db1ed64dc
150 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS_EXPLOIT_CLUSTER'. The 'PDF_UNESCAPE' firing suggests the JavaScript is obfuscated and likely attempts to exploit a known vulnerability within PDF viewers. The primary goal appears to be executing malicious code, likely leading to further compromise.

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
22c71f12d289aa3f51856f43f42694e063e071683182a98ee2d746de85003bfb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2279 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_off00000808.bin
77d9bcfad0e25a0c3e5f2c0f0137c98d7fc3bfa077ba5d9cc163d1495cbc75e5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x808 442 bytes

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