PDF malware analysis — malicious · 4589577cd56d5627

MALICIOUS

PDF

118.6 KB

MD5: 975681d4d9ee520d228455da7a3273f0 SHA-1: 8fc1f02f303017962a549f8ae07206d6e3ccaedc SHA-256: 4589577cd56d5627b581c86fc35376aac1eea8c062d982e5dcd7ca59d4d7fb34

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The sample is a PDF file that contains embedded JavaScript. Heuristics indicate the use of 'eval()' and 'String.fromCharCode()', suggesting obfuscated code designed to execute. The presence of a 'Large comment-padded JavaScript eval stager' heuristic and the ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggest this PDF is intended to exploit a vulnerability and download further malicious content. The extracted JavaScript file 'javascript_obj0006_000.js' is likely the stager.

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` `c0143f789adbcc15009c6ec77eac0134a7754e6d7f6b114a1bebf5b79e14c2de`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627052 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.