PDF malware analysis — malicious · bca0add494d81b66

MALICIOUS

PDF

118.6 KB

MD5: 46f9f71a2ca17000ba5f48bb5952401e SHA-1: 06fff7123312cf40517635500a65ed9d8a72b8ad SHA-256: bca0add494d81b6653916c5b539927397e1e32d3111bf59637e0d179a0bc2eb1

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript

The PDF file contains multiple high and critical heuristic firings related to JavaScript execution and obfuscation, including an eval() call and a large comment-padded JavaScript eval stager. The presence of embedded JavaScript streams and the ClamAV detection 'Pdf.Exploit.Agent-36086' strongly indicate that this file is designed to exploit vulnerabilities. The primary attack pattern involves leveraging obfuscated JavaScript to execute malicious code, likely for downloading and running a second-stage payload.

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` `ba1b2abafd393ab61b55df58d5f702cc5ac9e12a91c483e90d339f84c6db7fe5`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627355 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` `1986b4fd119b3522d549b140acc50ef3ecc3f24164a52f25cdc922cbc76c327e`	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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