PDF malware analysis — malicious · e4a8834fe7fd51b1

MALICIOUS

PDF

118.7 KB

MD5: e29b57327d7aa7a0c24d71995e394e37 SHA-1: 63722892c9f2bf455bdbef3d65189410a5d80a13 SHA-256: e4a8834fe7fd51b19a6aa13be627f6b7465af08b8d3d264144700fc4403cc293

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, as indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_LARGE_COMMENT_PADDED_EVAL'. The presence of 'PDF_EVAL' and 'String.fromCharCode' suggests code obfuscation and dynamic execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly indicates a known exploit. The ML classifier also flagged this as highly malicious. The primary attack pattern involves leveraging JavaScript within the PDF to trigger an exploit.

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` `4f0c8ea350d421ef9cd39d7525d5a726a808e2364e46ecfb74109bcd65e2c907`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626971 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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