PDF malware analysis — malicious · b10e18a6c2a86645

MALICIOUS

PDF

118.7 KB

MD5: 42a9e3339d5f378bd784f28d89c1c98a SHA-1: 9297b1cd37010fdc1bfc69f7671b643a8c9dd17a SHA-256: b10e18a6c2a86645bc8715b878866185cf7fabd3d5d1613a2ac6f9d72c147edf

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript

The PDF contains embedded JavaScript, including a large, comment-padded eval stager. Heuristics indicate obfuscated JavaScript and an eval() call, suggesting the script is designed to decode and execute a payload. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature, pointing towards an exploit attempt.

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` `8e7aad3a8d4cd5fd9ae606013e84119101cc352c24b2517cecfc026c6cf6d5d5`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627475 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).
`stream_001_off0001d747.bin` `c4830ec12d4b76e466099b43c9d54e9392b0eace06b60fe5678aca2d81c9999c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D747	300 bytes

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