PDF malware analysis — malicious · 9323b59acdf7e294

MALICIOUS

PDF

15.7 KB

MD5: c5c520b489c18b3484074597db1955a5 SHA-1: d4599a79dbb3d3c25b413d65adc86e3d43b37297 SHA-256: 9323b59acdf7e2942f3843cc38be20e114b70194688adb5a7d3232f1d3b953f4

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. High-confidence firings for PDF_EVAL and PDF_JS_LARGE_COMMENT_PADDED_EVAL suggest the JavaScript is obfuscated and uses eval() to execute malicious code. The ClamAV detection of 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The primary intent appears to be exploiting the PDF reader to download and execute further stages.

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` `937da2aa539539457913539d8a9885802685c30a97a7c11646c6f6d0e684a6bd`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425730 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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