PDF malware analysis — malicious · f66ec3e13e088ecb

MALICIOUS

PDF

15.7 KB

MD5: 15b9a5f1a17d234514bb219af7f1aa04 SHA-1: fce0b71f0edb83d7b4213708f14f232b60282464 SHA-256: f66ec3e13e088ecbf6b0b40c1ef55d2fd2f3158c24826328149a4c2b1fd52a2e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. A specific heuristic, 'PDF_JS_LARGE_COMMENT_PADDED_EVAL', indicates a stager pattern. This JavaScript is responsible for downloading and executing a secondary payload, as evidenced by the extracted artifact 'javascript_obj0006_000.js'. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms the malicious nature of this PDF.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `66dd50d5ad5b6c3738bbbeeb82025c2460f705d3971b329e64246053cb11e4a4`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424623 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).

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