PDF malware analysis — malicious · 8e2a8a52cdc1fa40

MALICIOUS

PDF

15.7 KB

MD5: 485ea938153a184f854a3c30088f8c37 SHA-1: 976ce09981be5435b89ecf29976c680b5220620e SHA-256: 8e2a8a52cdc1fa40aeb7b3d86028bfc08382d3a3654a2608050325f6cb58ffa1

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The file is identified as a malicious PDF by ClamAV. Static analysis revealed embedded JavaScript with multiple high-severity heuristics, including `eval()` calls and a large comment-padded JavaScript eval stager. These indicate the script is designed to obfuscate and execute arbitrary code, a common technique for downloading and running further malicious payloads. No document body text was available for analysis, but the script's behavior strongly suggests a downloader or exploit delivery mechanism.

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` `c7027bdac34f9919a26f5d482e73b4129e86518c7302cfe53e7a5af9c581182e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425394 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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