PDF malware analysis — malicious · 93c11635ba720403

MALICIOUS

PDF

15.7 KB

MD5: 0e4c22f0248619f280b1a98cedb7f2d1 SHA-1: 218647af45738d0f277e5c76f9b8c7cf13603a59 SHA-256: 93c11635ba720403de05df198451098c704b7f9db83d169f82f201e6956a943c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large comment-padded eval stager. This JavaScript is responsible for executing an exploit, as indicated by the 'PDF_EVAL' and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' heuristic firings. ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The exact payload or exploit target could not be determined due to obfuscation, but the overall pattern suggests a drive-by download or exploit delivery mechanism.

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` `6076ae0928172f2f11d8be7fa51a648af3184754c2124f026ecad694399e96ef`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425238 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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