PDF malware analysis — malicious · b5a5e6ce4aee308d

MALICIOUS

PDF

118.5 KB

MD5: bc30a29fc163fda3bd03a92008c5e4f2 SHA-1: 9b6bca47024cc56530cd1c6386b136c176cf7895 SHA-256: b5a5e6ce4aee308d1a9222ea6d15427122814dee495a509c4774712b5045d7ac

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The critical ClamAV detection and high-severity heuristics for PDF JavaScript evaluation indicate a malicious PDF. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is the primary indicator of malicious activity. The JavaScript likely attempts to exploit a vulnerability within the PDF reader to download and execute a secondary 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `90428d1efc4d3d7638d3e1b5fce8bd4b0ef917c9075e03ae4191ca9f2ea4ea58`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626720 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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