PDF malware analysis — malicious · 670b5fe494173131

MALICIOUS

PDF

118.7 KB

MD5: 4d66eb4e598c6ee17d75ada35f70f9d2 SHA-1: adf5f600f8933bcf44b42d82c2d6862c56142204 SHA-256: 670b5fe49417313126ff1a1974d552c2f916f408e195935b28bc9b9cec64dda9

256 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, including calls to eval() and String.fromCharCode(), indicating an attempt to exploit a vulnerability and execute malicious code. The presence of a 'PDF JavaScript exploit cluster' and 'ML_NYX_PDF_MALICIOUS' heuristic, along with ClamAV detection as 'Pdf.Exploit.Agent-36086', strongly suggests this is a malicious document designed to deliver a secondary payload. The JavaScript's primary function appears to be downloading and executing this payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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.
ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `59d7deb8b494168d3151aeba622ec7ec3584adf4f5c32f026df7708772b2961f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626457 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`stream_002_off0001d8f8.bin` `8f28e07148754dee8d0727e74ab6a3cb60c71a169068796d386ab1c3aff335b8`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D8F8	200 bytes

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