PDF malware analysis — malicious · 97672506bd32e137

MALICIOUS

PDF

118.6 KB

MD5: 9e8583f3823b264bece70a68095e50fe SHA-1: 21fec2f259ed8d826aaaf386350320015fdeaf4c SHA-256: 97672506bd32e137f3ed80b5876001c85d3548db125ab6b9866f5c81a6f78367

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript T1204.002 Malicious Execution: User Execution: Malicious File T1071.001 Application Layer Protocol: Web Protocols: HTTP/HTTPS

The PDF file contains multiple heuristic firings indicating embedded and obfuscated JavaScript, including a 'Large comment-padded JavaScript eval stager'. The presence of these JavaScript streams, particularly those involving 'eval()' and 'String.fromCharCode()', strongly suggests the execution of malicious code. The ClamAV detection of 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The primary function appears to be the execution of obfuscated JavaScript, likely to download and execute a secondary payload, which is a common technique for PDF-based malware.

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` `1068398d05adde0805fc3b914612e804a2be9684bc5c004391eb01da32732c8f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627425 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` `8571ce01c76a3a1b4de233916563a767bd9d73459a3c46ded64a8bdf0dfa3e44`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 665 long base64-like blob(s).

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