PDF malware analysis — malicious · c07a0a6026fbd7e1

MALICIOUS

PDF

118.6 KB

MD5: ad380584cebbd96b2dc13957f3dc08be SHA-1: 2ed3507e9288eccf11148334c26a0a4b91faadbf SHA-256: c07a0a6026fbd7e15f666d3103542eb1c195b793038a4014266024484bf5131d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' firing suggests a stager mechanism. The presence of 'eval()' and 'String.fromCharCode' within the JavaScript stream points to obfuscation and dynamic code execution. While the document body is unreadable, the critical ClamAV detection 'Pdf.Exploit.Agent-36086' and the extracted JavaScript artifact 'javascript_obj0006_000.js' strongly suggest this PDF is designed to exploit vulnerabilities or download a secondary 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `3daef65218de7d9b8b89a0a2265f1c9db5961cc76bb31daca29d66aff54669d2`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626981 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).

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