PDF malware analysis — malicious · c17609066ffc550f

MALICIOUS

PDF

15.7 KB

MD5: ca298ba3e21c352ccec6122f0ea47cf6 SHA-1: 346cd160ce75a99b8a2f76890d24099e29a66a56 SHA-256: c17609066ffc550fe4499a01c29417c27f72a5a083e554460c5ea3f39e7f3c14

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' heuristic specifically suggests a stager designed to execute code. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms malicious intent. The primary function appears to be the execution of obfuscated JavaScript, likely to download and execute a secondary payload, a common technique for initial access.

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` `3d13c689c1d7b01955e48bf9ab658e82c75c874aa1f525d6ae824bf5ba3b3dc8`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425142 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).
`stream_001_off00003b72.bin` `72221acea5e9715c0dc2741ab5cad0954f79b3223af8638d3cd2ba78068f1a24`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B72	300 bytes

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