PDF malware analysis — malicious · 8fad3d4cbdb616ae

MALICIOUS

PDF

118.5 KB

MD5: 36b63f5d4b5da39664d0bec529cc28af SHA-1: f5c2bb15aa40f82e7fa1b77e8685f45cee497511 SHA-256: 8fad3d4cbdb616aea5958d63a349a369b7da9ad1f7ed57bf49239b28e29ff45b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. A critical heuristic, 'CLAMAV_DETECTION: Pdf.Exploit.Agent-36086', confirms its malicious nature. The presence of 'eval()' and 'String.fromCharCode' within the JavaScript streams suggests obfuscation and dynamic code execution, likely to download and execute a secondary payload. The extracted artifact names 'javascript_obj0006_000.js' and 'legacy_pdfkit_stage_000.js' further support this. The document body was unreadable, but the technical indicators point to a typical 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `043c22a3822dc1dfec45e1ef845a643508363f1bce2d899f8db9242eb5d43268`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627396 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).
`legacy_pdfkit_stage_000.js` `1f7b719aeeb83d05706e7e6c796c5cb8e3940d14dbef2f065fff1a11e3c7d7a9`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 692 long base64-like blob(s).

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