PDF malware analysis — malicious · 2fb6678bc7af4461

MALICIOUS

PDF

118.5 KB

MD5: c1ac4d83ca1dbcc6c2d0db1cab3a3765 SHA-1: 933f0ceef42d2dcebced385ddd77d51bd40902ba SHA-256: 2fb6678bc7af446110ed8b0f05f75b502bc59c3dedf76b5816fbf6a2f7e0566f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript

The PDF contains embedded JavaScript, including a large comment-padded eval stager. The presence of `eval()` and `String.fromCharCode` indicates code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests this is an exploit delivery mechanism. The obfuscated nature of the JavaScript and the large size of the embedded streams point towards a complex, multi-stage exploit.

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` `946e761689c1cb8acb3a648c40952b3251c18bec3dfcccba1b803fd00a138299`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626170 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` `5dbd8921a1511420052119668c31223446e11c8bf6eff18f896558ea2a0776cb`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 515 long base64-like blob(s).

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