PDF malware analysis — malicious · 353412a89510ff58

MALICIOUS

PDF

15.7 KB

MD5: 878cfc39562214a255cc7be916b9c024 SHA-1: 577901af939ea55947fe34a328134454903334fe SHA-256: 353412a89510ff5823b54a1a0120116539aa27abc53ff2748877e0ac8bcb3545

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution: JavaScript T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File Execution: User Execution: Malicious File

The PDF contains embedded JavaScript, including a large, obfuscated eval stager. This JavaScript is designed to execute arbitrary code, as indicated by the 'eval()' call and 'String.fromCharCode' usage. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is a known exploit delivery mechanism. The file's structure and heuristic firings point to a malicious PDF designed to exploit vulnerabilities via its JavaScript content.

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` `a96dcd5477ee6dc4a81df7613a84887bb969dec7cbcfcb189754e6de591594ed`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425443 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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