PDF malware analysis — malicious · 8b091855a3dfba91

MALICIOUS

PDF

118.6 KB

MD5: af5852fc7035d7d364fdf7fee8731365 SHA-1: 818761e1c6eab84ec0b1e7603cf05b751bdf0da2 SHA-256: 8b091855a3dfba9173a82424b64ff6842c3612ea8dbbf39d1ef277fa829afcc7

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The file is a PDF containing obfuscated JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE, along with a 'Large comment-padded JavaScript eval stager' heuristic, strongly suggests the execution of malicious code. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The JavaScript likely downloads and executes a second-stage payload, though the exact mechanism is obscured.

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` `bbff8f2d50fce1a51e304768f666894250db3c7244735c9f73017b765ebf2486`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626584 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` `1fc8ff809eec66dead1058c0f4549a81f0a770c19943774a6a06964c2faf777e`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 625 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.