PDF malware analysis — malicious · 8d5fbfc202f5b916

MALICIOUS

PDF

118.4 KB

MD5: 4b0c213125b6d93c14617a61a7cd9e2c SHA-1: 9ff051cd467f7c092528eedd68d89d2b87996cb8 SHA-256: 8d5fbfc202f5b916c665ec5c5df5b215b3b9444381c2d123534b06620a4d7398

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscated code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly indicates malicious intent, likely involving the execution of a second-stage payload via the JavaScript.

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` `0c3d1159d19c659640bc84919cd9f458599e05174d02b25a2dbf6ffb8d91c387`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626851 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_off0001d64b.bin` `d5b5af0958a14408c95f413b8350d6fad249e276603c78359d5ed820836eece5`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D64B	300 bytes

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