PDF malware analysis — malicious · eef27b04dad162f5

MALICIOUS

PDF

118.7 KB

MD5: 7e9104f0834351f2ec0ca1b9ca332ddd SHA-1: 85967a6807b5a98161ac2a37b16ac2a176b4abde SHA-256: eef27b04dad162f54802ddcd4f73e32694a1462d4bc1defcb6a8125c81caa9dc

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36086. Static analysis revealed multiple JavaScript-related heuristics, including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE, indicating the execution of embedded JavaScript. A specific heuristic, PDF_JS_LARGE_COMMENT_PADDED_EVAL, points to a stager designed to obfuscate JavaScript execution. The presence of these indicators strongly suggests the file is a malicious PDF leveraging JavaScript exploits.

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` `a38022a831e99f26d9725b7f446acf8dfad606629732abef76df694088359289`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626067 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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