PDF malware analysis — malicious · 8bf8530c06e582c3

MALICIOUS

PDF

118.5 KB

MD5: 6e1a1b698576829832326184d1a1ef75 SHA-1: d3a2e7fa99091f492c935e8ae56d94228d99e29b SHA-256: 8bf8530c06e582c3922ca85feaa47a9f960ab8e7a330d2c3fe39bcf850bf370e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The critical ClamAV detection 'Pdf.Exploit.Agent-36086' and multiple high-severity heuristics (PDF_EVAL, PDF_JS_LARGE_COMMENT_PADDED_EVAL) indicate this PDF is designed to exploit vulnerabilities. The embedded JavaScript, particularly the 'eval()' call and the 'String.fromCharCode' usage, strongly suggests it's a stager for downloading and executing additional malicious content. The presence of a large, obfuscated JavaScript stream further supports this. The exact payload or target URL could not be determined due to obfuscation, but the overall pattern is consistent with a PDF-based 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` `ec13d473ac704759cf9d983f82f6040e75f5f6f9df8c35afb4a1293d42ed4bad`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626700 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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