PDF malware analysis — malicious · ea8e5b1dcc4d3060

MALICIOUS

PDF

118.7 KB

MD5: 49e5a0ff3a18f3527c21cff46837a1c9 SHA-1: da9642f9b118c0ac7bf3e483a81f56287ecef3c1 SHA-256: ea8e5b1dcc4d3060e2e11544c4aa7fe5ce9c4f1573812ffb8ed9342e0e89df4b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and a large comment-padded eval stager. ClamAV detected this as 'Pdf.Exploit.Agent-36086', suggesting it's a known exploit. The obfuscated JavaScript is designed to execute malicious code, likely to download and run a second-stage payload.

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` `a416c25f85ec04ae68da68d99e252bc45cf0956a4d93f1b304aa0a0f3e81dd0d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626605 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` `b9789f16ee6adfd36c758dd4c1144ae600c909dc4e7017ca359eb7b9bac15675`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 634 long base64-like blob(s).

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