PDF malware analysis — malicious · fc61b33d6c58227d

MALICIOUS

PDF

225.8 KB

MD5: 0312c1049a3d44f19a877efe0556a708 SHA-1: 25baba7dd80c7e4312e882c32d5903e36fb6368f SHA-256: fc61b33d6c58227def02e28d90f00962d78bb9b17268a5d3e00268ac6092b436

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript with multiple obfuscation techniques, including `eval()` and `String.fromCharCode()`. This script is designed to execute arbitrary code, as indicated by the 'Pdf.Exploit.Agent-36086' ClamAV detection. The primary function of the script appears to be downloading and executing a secondary payload, although the exact URL is heavily obfuscated. The presence of JavaScript actions and streams within the PDF strongly suggests an exploit delivery mechanism.

Heuristics 6

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)
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` `29697f5fd101bd0a11ced9cf8adc0c2764650d5d39e4d7d1c0fb4151530fca4d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	317538 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).

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