PDF malware analysis — malicious · 6bc6cbe73e85abac

MALICIOUS

PDF

285.3 KB Authoring application: PyPDF2

MD5: e96c94c35ab06e20b61230530ed3467d SHA-1: 53c2c99247389c1b414997b4386f4bf9731a1521 SHA-256: 6bc6cbe73e85abac0cf9df7f974c3de8ee6132b32f27fdb1101c060f614d4a1c

168 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 streams that are heavily obfuscated and utilize eval() calls, indicating an attempt to hide malicious code. The ML classifier strongly flagged this PDF as malicious, and the presence of exploit cluster signals further supports this. The primary function of the JavaScript appears to be downloading and executing a secondary payload, though the exact URLs are not directly extractable from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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
Suspicious extracted artifact medium 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.
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.
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.
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://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `42b4366f811fda2212945ace4f6e1e7116a93e6dea6cab8f9fae62e7501c152d`	pdf-javascript-stream	PDF /JS object 11 at offset 0x40B	95451 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0011_001.js` `d2b3e11320485d0b8e080b25bd642ba8d2d43d3614ba9d92abcda3d6a231c1fe`	pdf-javascript-stream	PDF /JS object 11 at offset 0x40B	94083 bytes
`new_array_token_stage_000.js` `c453f153b6474d074afcf6a5fd04e907070f403164d7222766cf2465fc80d3f9`	deobfuscated-js	new-array token-map decoded JavaScript object 11 at offset 0x413	17011 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s).

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