PDF malware analysis — malicious · d5ee95d1b872b900

MALICIOUS

PDF

118.6 KB

MD5: ff730b9024b6afd338120d40cc5f1c34 SHA-1: e0c3864a8e922eaccc385b424e71561f7f01b460 SHA-256: d5ee95d1b872b900a608b5ccee2b181819b0d1354824537d4cffff5d54f1cb9c

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode(), which are indicative of obfuscation and execution of malicious code. Heuristics indicate a 'Large comment-padded JavaScript eval stager' and a 'ML classifier flagged this PDF' with high confidence. ClamAV also detected it as 'Pdf.Exploit.Agent-36086'. The primary attack pattern involves leveraging JavaScript within the PDF to execute an exploit, likely for downloading and running a secondary payload.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `ebd4b2b541e3305ed8d29796662e97b15bab50e808876f92a0c5016de5579edb`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626807 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` `0a7b3869b038eaba065a7def8a3ed8ddfbaaa2212661d9df891e93f410b9adb5`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 691 long base64-like blob(s).

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