PDF malware analysis — malicious · fb29bcf9ee76c239

MALICIOUS

PDF

118.6 KB

MD5: d86b5bf0bc587462b3621a281fbd0426 SHA-1: c53c28d883e9ccbc2ed5b38ee44e643bbebadc73 SHA-256: fb29bcf9ee76c2395b5410cbdd0f9f91e4b9cb79ee5d21d9277f5b3adddda2e9

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript with multiple high-severity heuristic firings, including eval() calls and a large comment-padded JavaScript eval stager. The JavaScript is likely used to download and execute a second-stage payload. The presence of PDF_JAVASCRIPT and PDF_JS heuristics further supports the use of JavaScript for malicious purposes within the PDF.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `998bf8130119ea1efa1f8310ee25ea2a2776805eeff309c828d411a522922bdc`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627735 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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