PDF malware analysis — malicious · 33bc2f4f8bbbde94

MALICIOUS

PDF

15.7 KB

MD5: 27bcd49ced1b722e595db95242ec9dfc SHA-1: 140c4849642f5c0444874828724c418dc658b328 SHA-256: 33bc2f4f8bbbde94180b60b04e0e82aaa7d924ba4554fe296a5a130196dd9253

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating an attempt to obfuscate malicious code. Heuristics suggest a large, comment-padded JavaScript eval stager, commonly used to download and execute further payloads. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly supports this. The extracted JavaScript files, though large and potentially obfuscated, are consistent with a stager designed to exploit PDF vulnerabilities and download additional 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` `1d293da2ad55af5b2ef5a722b0de83613e90125ab48111e5c13f342853d42637`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425238 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` `b626d94297944df959429c665fa1b66b2454d00ebaee98fa43e7f3ea3037a5a0`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 534 long base64-like blob(s).

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