Malicious PDF — malware analysis report

Static analysis result for SHA-256 70474d19f3992ed3…

MALICIOUS

PDF

6.9 KB
MD5: dfeb0811f39d3d89a0539b1f895c449c SHA-1: 5cf797372aedb5a3388b05bd00b94f2897e45eed SHA-256: 70474d19f3992ed382de19235a5cefad6cd0a5808519165854e021bae04de2ff
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 obfuscated and uses the unescape() function, indicating an attempt to exploit a known PDF vulnerability. The ML classifier strongly suggests maliciousness. The JavaScript is likely designed to download and execute a second-stage payload, although the specific URL is not directly visible in the provided evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
bfb8c8ba6bc8293cd29f31e39f8402ce31db8c405f53ec74ca26c758a931eb2d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2099 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
objstm_0024_00.bin
a6f6562d20c114290be8ce32aad5eb71f7b3f53f4e9a9983584874e54a84dfd5		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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