PDF malware analysis — malicious · d909792b3c1a6a9d

MALICIOUS

PDF

118.7 KB

MD5: b4696e06b884fab41d5bc6a9fb2cd508 SHA-1: 139f82ed128418b675310758774de902a0cb8f19 SHA-256: d909792b3c1a6a9d06fc6f4e6f969ceb402de92618d5fd4109d8ed434f21028b

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 high severity heuristic 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' suggests a stager designed to obfuscate its malicious intent. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The primary function appears to be the execution of JavaScript, likely to download and execute a second-stage payload, which is 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` `3c8df820fc0c049cc7537c94011727e51383cf9eb961a86ff31027a8de9e0a8e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626765 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_002_off0001d8e5.bin` `7678dfd6b262a3860de08211934c17dd3cddd6ca3e229c924c0a68e78fbf499e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D8E5	200 bytes

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