PDF malware analysis — malicious · 18abfab0c6d11d86

MALICIOUS

PDF

118.5 KB

MD5: 68a79ae64935ac20818f93ac28eb9ecb SHA-1: 594c973e8034ec4023358c58b51e410455644fc5 SHA-256: 18abfab0c6d11d86171e28f03c650c2e08db08bf39eca1e9048735f50b1dc8ec

256 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains obfuscated JavaScript that utilizes eval() and String.fromCharCode() functions, indicative of an exploit. The critical heuristic PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS strongly suggest malicious intent. The embedded JavaScript is designed to download and execute a second-stage payload, as indicated by the 'PDF JavaScript exploit cluster' and 'Large comment-padded JavaScript eval stager' heuristics.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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` `1338c53211d3f127588a8accda8aa3ee1e9b6fb9f50c6021d09129f50224088e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627140 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_002_off0001d821.bin` `529a1dcf30f107ce401ff4d5b5228ec0214e5a20fd1587c161595f8cd01493fe`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D821	200 bytes

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