Malicious PDF — malware analysis report

Static analysis result for SHA-256 1984517dde86be7c…

MALICIOUS

PDF

7.8 KB
MD5: 9a3e1d05a19f1cc998340550841d90bf SHA-1: b2e96799aadcb7176bb0c2ad7b5a277c6d1e7b6f SHA-256: 1984517dde86be7c4d12aef10876adcfc284010225490e2cd42cb6879be0dfee
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that is executed using an eval() call, indicating an attempt to exploit a client-side vulnerability. The ML classifier strongly suggests maliciousness. No specific malware family could be identified, and no malicious URLs or other IOCs were extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9483

Heuristics 5

  • 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)
  • 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_off00000328.bin
3cc501f822a242374f08635c961a0a96014d71a1d7879c235be49032be6eefe3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328 2440 bytes
objstm_0024_00.bin
dd1c2dac68e71c127cfcc1c0acfa983ce3a340b7999ad0c0765e941bcac24212		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 507 bytes

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