PDF malware analysis — malicious · 83e7c49ff338c09a

MALICIOUS

PDF

118.6 KB

MD5: 87f7fb40ee84afa1c72e5822eef110fd SHA-1: f36e20e8acdef067eab4dc2fb10822bdd24ecedf SHA-256: 83e7c49ff338c09a72f2b0c0bb4227dab556ff86a944b9b1e1f8ecb3aa945321

166 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was detected as malicious by ClamAV (Pdf.Exploit.Agent-36086). Static analysis revealed embedded JavaScript streams, including a large, comment-padded eval stager. This indicates the PDF is designed to execute malicious JavaScript, which is commonly used to download and execute further stages of an attack. The presence of JavaScript actions and eval calls strongly suggests an exploit or downloader pattern.

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` `76f019064e3f40ccc90105d2cff675725a033812a348dcca7e2362351517c36b`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626576 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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