PDF malware analysis — malicious · 3f3cf6857c5d7604

MALICIOUS

PDF

118.6 KB

MD5: d466efdc61e98176541b421ef31b7749 SHA-1: 744ae2fe0948a8ad74b5bedbe6772015f40c971b SHA-256: 3f3cf6857c5d760441d7759fb9f4f613f19ec4224b291eb75a0d0afca2d7a8fa

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, with high-confidence heuristics indicating the use of eval() and a large comment-padded JavaScript eval stager. ClamAV also detected this file as 'Pdf.Exploit.Agent-36086'. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'Suspicious extracted artifact' heuristic which noted long encoded blobs and script obfuscation. The exact nature of the payload or its download URL could not be determined due to obfuscation.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `485f3ac1f74b086ae18e3950dcbf77342c655c52fd21b1b0a65aca86b9f63986`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627290 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).
`legacy_pdfkit_stage_000.js` `f738fbdc02d42ca08c5f25bd87b253e9f475901db6d22812bfede6ae2a8fd330`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 583 long base64-like blob(s).

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