PDF malware analysis — malicious · f629f3b2aab18a46

MALICIOUS

PDF

225.6 KB

MD5: b3a8f72bf299960462e80aa4f7ecc660 SHA-1: ddc6e156ed88b7768fc000bfc6991b579dc4baf2 SHA-256: f629f3b2aab18a46fc2116225bec3c1640e5a61cca545a4b14f553f49fcdff17

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, which utilizes eval() and String.fromCharCode() functions. This JavaScript is highly obfuscated and likely responsible for downloading and executing a secondary payload. ClamAV detection of 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The primary attack vector appears to be exploiting a vulnerability within the PDF reader to achieve arbitrary code execution.

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` `a6cb32b8dbac05eb50ab1180616a7c5d3c487769544d154f3306b67dc8ccc5da`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	317331 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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