PDF malware analysis — malicious · a57883c7959b35d0

MALICIOUS

PDF

118.5 KB

MD5: ca2840fd248d444e6a6477294a838b84 SHA-1: bd7c495458fa285b0d08c044a7715c2c7869b578 SHA-256: a57883c7959b35d0a0d4dc44a70919bf9281e0a2eed52f1c8fe724ec00120edd

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, which is heavily obfuscated and utilizes eval() calls and String.fromCharCode, indicating an attempt to hide malicious code. The presence of a 'Large comment-padded JavaScript eval stager' heuristic firing and ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests this PDF is designed to exploit vulnerabilities or deliver malware. The JavaScript likely downloads and executes a second-stage payload, though the exact URL or mechanism is obfuscated within the script.

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` `bf9359628a7a47f7685bf10b84311805fcad4c3c509dd79f93d23d560bcad9d0`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627518 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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