PDF malware analysis — malicious · a1708c17210a8c97

MALICIOUS

PDF

118.5 KB

MD5: f09ab88b04396a04a9f936a31dd5465c SHA-1: 39415d22f150bf0cc5fb087ba145555bc5a01a98 SHA-256: a1708c17210a8c9769ef04edd0b49f84e513276867f8eb4b9e9adf63d685c430

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file was flagged by multiple high-severity heuristics, including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_JS_LARGE_COMMENT_PADDED_EVAL, indicating the presence of malicious JavaScript. The ML classifier and ClamAV detection further confirm its malicious nature, identifying it as Pdf.Exploit.Agent-36086. The embedded JavaScript, particularly the obfuscated eval stager, strongly suggests the document's purpose is to download and execute a secondary 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` `92b4bd5d19173ac02740a8b6e714c132ba38ec124dc8cb77cf0349c470dbedd1`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626369 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` `8fda60f528027913dfca0a703b162d5b0ee4d3da380527a025c0c8d96b971b96`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 590 long base64-like blob(s).

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