PDF malware analysis — malicious · 64bba63674b8fdd6

MALICIOUS

PDF

8.3 KB

MD5: 4d8ca9f4808e791df39d7c58d0ca3e8b SHA-1: 3b8a49873454c0542ecba40ac8403b1674aeb2bb SHA-256: 64bba63674b8fdd686fa08d9035d1f5b4753e8f06aa03970b7ee4a04b326320b

158 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 that utilizes eval() and String.fromCharCode(), indicating obfuscated code execution. This cluster of heuristics, particularly the PDF JavaScript exploit cluster, strongly suggests the file is designed to exploit a vulnerability to run arbitrary code. The ML classifier also flagged this PDF as malicious. No specific family could be identified, and no URLs were extracted that could be considered IOCs.

Machine Learning

Nyx PDF Classifier malicious score 0.8836

Heuristics 7

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)
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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.

Filename	Kind	Source	Size
`stream_002_off0000032d.bin` `9243828e5702d3e92e1984501a63c1f84d68f0d924d22b39bbcdfc9729cfba74`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x32D	3196 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_003_off00000b85.js` `2d0e1efdfa6110385aac29417e1a9d65e8e7ccab9271cd5a5863752fe736691a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB85	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` `b1702c76b43aa0ca1f8fd0afe0257496c83b41e9b45d212049c8e2a9e13b6599`	pdf-objstm-decoded	PDF /ObjStm 25 0 obj (inflated)	432 bytes

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