Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efe3cd324cbd8a1…

MALICIOUS

PDF

8.0 KB
MD5: 4072a270f7b7453faf1a761b6c97db21 SHA-1: ecc25997c6a3b0e6db21884e5de11e448170a7e5 SHA-256: 6efe3cd324cbd8a1110520213000a55d09e165807b83c3a7363ca2cf64b5f5d9
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. The presence of a PDF_EVAL heuristic and the PDF JavaScript exploit cluster strongly suggests that the JavaScript is designed to exploit a vulnerability and execute arbitrary code. While the specific JavaScript content is obfuscated, its presence and the exploit cluster signal indicate a malicious intent to download and execute a secondary payload. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9164

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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000032c.bin
b829072b95e724dec41da9a0858774ca280d4a00b8f94443b20a012262990c50		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C 2704 bytes
stream_003_off00000a69.js
2d0e1efdfa6110385aac29417e1a9d65e8e7ccab9271cd5a5863752fe736691a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA69 372 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0025_00.bin
5f4691d467778e77ec4082de7870d48694a8de0a6a0ac1426be9050955d9d9fe		 pdf-objstm-decoded PDF /ObjStm 25 0 obj (inflated) 375 bytes

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