PDF malware analysis — malicious · 797a0bb61a79c075

MALICIOUS

PDF

8.3 KB

MD5: 0239b9aef3279581deab280dda5ab482 SHA-1: 19e020379671cf1adebfa6705baa119ea3aadcea SHA-256: 797a0bb61a79c075ed60c8bf30784c831a2c225df1b578ee5daf9e74b1f079fe

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains obfuscated JavaScript that utilizes eval() and String.fromCharCode(), indicating an attempt to execute malicious code. The ML classifier also flagged this PDF as malicious. The JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for initial compromise via malicious documents.

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_off0000032a.bin` `2a0c4de0e4cda35a63549b8c6b08c23faf61299c9f8edf9966ecfbc1b27d1ae2`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x32A	3194 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_003_off00000b7e.js` `2d0e1efdfa6110385aac29417e1a9d65e8e7ccab9271cd5a5863752fe736691a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB7E	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` `970bcf7095d4e0aca365dd316a6ef53b599d74b643b534953917cdf6a5731bc7`	pdf-objstm-decoded	PDF /ObjStm 25 0 obj (inflated)	375 bytes

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