PDF malware analysis — malicious · 9a2e9983151d0722

MALICIOUS

PDF

118.5 KB

MD5: ea9dd8a351cf9f70cc3aba498991d53f SHA-1: bf4bf3f13fb2120e0e9b69d92009859c3fe23a14 SHA-256: 9a2e9983151d0722aca25805776f371f3d97554ed39c7cd7724e1c097ced0ab5

196 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript with multiple high-severity heuristic firings, including 'PDF_EVAL' and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL', indicating obfuscated code execution. ClamAV detected this file as 'Pdf.Exploit.Agent-36086'. The ML classifier also flagged it with a very high probability of being malicious. The presence of JavaScript and exploit-related heuristics strongly suggests the PDF is designed to deliver a malicious 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` `7f844c26d4d7c76bd848f88a4669d1e70538d0f40511ff72ac26afe10bdfaaf4`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626737 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` `8cc13ba02a6c3d30a79572d0a7c0d7c3fa7b9691b8f0f12c6aa46d409d28c54b`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 635 long base64-like blob(s).

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