PDF malware analysis — malicious · d0c1b8a629e84da6

MALICIOUS

PDF

118.7 KB

MD5: 75717e944fca4e91d71d217cbf0a54b0 SHA-1: 8d397460e9b5a4056fdc3a7f022bfc5bda3b32bc SHA-256: d0c1b8a629e84da6e30599d193ef305b58daf13e50bdf642fd1519f089f57fea

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded JavaScript, including a high-severity heuristic for a large comment-padded JavaScript eval stager. ClamAV also detected the file as 'Pdf.Exploit.Agent-36086'. The presence of eval() and fromCharCode functions within the JavaScript stream indicates code execution and obfuscation, typical of exploit delivery mechanisms. The primary function of the script appears to be downloading and executing a secondary 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `98e3970be5c1f290bb988f468a1ac30ddbe8d2f31f4f66af8b807e5e156f835f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626933 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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