PDF malware analysis — malicious · 40cb6c20c5b0fb70

MALICIOUS

PDF

15.7 KB

MD5: ccb74b576bee606df0b4227c41bd1d13 SHA-1: dfe570e59b52dc5d8a3f6189f71e264571c15114 SHA-256: 40cb6c20c5b0fb7085f2419ce40c287ca5c0e4d4f0980bf9257e4dcbad24d122

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large comment-padded JavaScript eval stager. Heuristics indicate the use of eval() and String.fromCharCode, suggesting obfuscated code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly indicates a malicious exploit. The embedded JavaScript streams are large and appear to be obfuscated, likely to download and execute a second-stage payload.

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` `76f2734c07ce1adc7c955bdf0aa8d117d1569d2007d05657189d3292a3b6519a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425771 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` `3fd689d9ca633ac18e324a808d1497082bb7f63091b02da0cbd77ac4826f574b`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 638 long base64-like blob(s).

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