PDF malware analysis — malicious · c1e4bbacd753c35b

MALICIOUS

PDF

118.6 KB

MD5: 63e6189de6e14cdc827501cf60bf67cb SHA-1: 88c1b51e971c6b9d5dddb8762beafa9116a47cc7 SHA-256: c1e4bbacd753c35b9426612083865c4320d477295b15294fd06b449bbb9e5689

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' heuristic suggests a stager designed to execute obfuscated JavaScript. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The presence of large, obfuscated JavaScript streams points towards a downloader or exploit loader, aiming to fetch and execute further malicious content.

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `3bfea36354b8f3af328535a188417727d3f3154f9e91a5e03f5c1ecccfa76b4f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627353 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` `390804c88d421a0786b159507f19ca71993481964742b06c43c4c22614515a45`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 642 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `e8d196a1d3614f7a6a155cb86e65689a7eb0e5eb9863bf4a1033bc3bb6ad8923`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 692 long base64-like blob(s).

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