PDF malware analysis — malicious · 3865d1bf3c27a3d2

MALICIOUS

PDF

118.8 KB

MD5: 5b8d4fda3c72cbcc98811693e0070cc5 SHA-1: 46ef07d360cf5c00a370305714c8a3ceb40412ce SHA-256: 3865d1bf3c27a3d28164716b9af75a79dd420b9db2b3b63f83aa013709e3b94c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. A specific heuristic, 'PDF_JS_LARGE_COMMENT_PADDED_EVAL', suggests a stager designed to execute obfuscated JavaScript. The presence of 'eval()' and 'String.fromCharCode' further supports the interpretation that the script is attempting to decode and execute malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36086' confirms the malicious nature. The primary IOC is the embedded JavaScript file, which is likely responsible for downloading and executing 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` `a4e33d4b57231290222fd37df71172c1d77fde13cfadee80f73c289f48d97d98`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627668 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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