PDF malware analysis — malicious · 87bc2d135ad41f9f

MALICIOUS

PDF

118.6 KB

MD5: f1d8bf5991a0971be665050985c6d1aa SHA-1: d36732d541e957bb1738df1c06e0eed983a5ef30 SHA-256: 87bc2d135ad41f9fcbcb9910d9d94cc467d5b9d1ba3d241ef96e033ab86d3d97

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple high-severity heuristics including PDF_EVAL and PDF_JS_LARGE_COMMENT_PADDED_EVAL. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be the execution of obfuscated JavaScript, likely to download and execute a secondary payload, as suggested by the 'eval()' calls and the 'Pdf.Exploit.Agent-36086' ClamAV signature.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `a2fa40c32744ef23e10713c7ecec86adb040e5f3d924013371d22d32036ac0b6`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626945 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).

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