PDF malware analysis — malicious · 8e5cb394287ba744

MALICIOUS

PDF

118.5 KB

MD5: 207871a531d15236777a350b2c885a62 SHA-1: 1a5f9199aca6ce9ee2b6ca6c3770515278391ddc SHA-256: 8e5cb394287ba744fddf57d6d68b51404425612545d69d41c75bba8e0b0868cb

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains multiple JavaScript-related heuristic firings, including a 'Large comment-padded JavaScript eval stager'. The embedded JavaScript stream, identified as 'javascript_obj0006_000.js', is heavily obfuscated but the presence of eval() and String.fromCharCode() suggests it is designed to download and execute a secondary payload. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature.

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` `de72be37b7e409ecda66b017e637e8e94b8692d60b299f5f0512c1a0ae2063ba`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627915 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).
`stream_002_off0001d851.bin` `37f779e955c3769a552db2411906cf958a5acd3650e2827c4be786a13e32f67f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D851	200 bytes

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