PDF malware analysis — malicious · 97a8508201e71fd5

MALICIOUS

PDF

15.8 KB

MD5: f7d7662122e395c7274f8399f7daec4b SHA-1: 4f0ed4db94391cfa1b7c4524234a65b65bc0f3e5 SHA-256: 97a8508201e71fd5a82b509f7bf6d25859f1ebdcbede7109de9882724179d450

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The file is a PDF containing embedded JavaScript, which is flagged by multiple high-severity heuristics including 'PDF_EVAL' and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL'. ClamAV also detected it as 'Pdf.Exploit.Agent-36086'. The presence of JavaScript, particularly with eval() calls and obfuscation indicators, strongly suggests an attempt to execute malicious code, likely a downloader for a second-stage payload. The ML classifier also returned a very high probability of maliciousness.

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` `4b0a2a7d359ddb8b695df1121c1bf7b20b3ad0a99d6477335f31296f608feb6a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425723 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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