PDF malware analysis — malicious · c10dc31b5dc6d9ad

MALICIOUS

PDF

15.7 KB

MD5: 36554481b1fe22c38ddc036be1335e78 SHA-1: b48dc2baf5099e7a56b5c7a00d816aa9b78907ef SHA-256: c10dc31b5dc6d9ade1c7c4a5ca1e6b862127ff8a6e3912a969afe6476e111885

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple JavaScript-related heuristics, including eval() calls and a large comment-padded JavaScript eval stager. ClamAV detected this as Pdf.Exploit.Agent-36086, indicating a known exploit. The embedded JavaScript stream, although large, is likely responsible for executing the exploit and downloading a secondary payload, which is a common attack pattern for malicious PDFs.

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` `802b71ce1084a8a6a18c7e1fa8cc38010ededff42cabc1ac4290fa9e565e7abb`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424787 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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