PDF malware analysis — malicious · 4c332e134cbac3a1

MALICIOUS

PDF

118.5 KB

MD5: 80ec0a3b526b9a51a0fef9b30c18b9cc SHA-1: 367fddd08f6cca4c6573a9c49a98360819d0b4ea SHA-256: 4c332e134cbac3a1cf838a3d3e7160dac2d22f8232ad1a3d1a07fbbf27d7fb8c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is identified as a malicious PDF by ClamAV with the signature Pdf.Exploit.Agent-36086. Static analysis revealed multiple high-severity heuristics related to JavaScript execution, including eval() calls and a large comment-padded JavaScript eval stager. These indicate the PDF is designed to download and execute a second-stage payload.

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` `b8567232bd84557f619b77006656750edb3975f54f73cc5e4fa2052dbd2f101d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626224 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_off0001d663.bin` `b3d64485ca725e680056523b1a34c48853aa1add6e17d40cbbb74391dfe18a87`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D663	300 bytes

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