PDF malware analysis — malicious · 82bd1a6cda72c762

MALICIOUS

PDF

118.6 KB

MD5: e20be68d8acb7cfb2cf7b7258cf203e4 SHA-1: 2e31b15928c4e0e7099bb0d82f59fc539b415939 SHA-256: 82bd1a6cda72c7622e9bebff4a74cbecb51f1d05e79a9a6255b71872c8c2c49d

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript, including a large comment-padded eval stager, indicating it's designed to execute malicious code. High-confidence heuristics like ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION confirm its malicious nature. The presence of JavaScript actions and eval() calls suggests the script is likely responsible for downloading and executing a second-stage payload, as indicated by the ClamAV detection name 'Pdf.Exploit.Agent-36086'.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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` `fc96f2120a17ccea9298bd278ab0e1c3adfa5f12163128ae0b806de8027b4d9e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627276 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).
`legacy_pdfkit_stage_000.js` `0e91e0f14182324728e374ba2c0c89ede07a210071eda4496be1c93a3bf8a59a`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 638 long base64-like blob(s).

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