PDF malware analysis — malicious · 04b03ee5a1407239

MALICIOUS

PDF

97.2 KB

MD5: 13d115b8536fffb1cfbf9dc68d96caa6 SHA-1: 0f688250ee7789eb423152d50da968d190c5953c SHA-256: 04b03ee5a1407239ab7c5e53c277542991e36d984cccc5f5e12e82587695be59

248 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that utilizes the unescape function, a common technique for obfuscation and exploit delivery. The critical heuristic 'PDF_JS_EXPLOIT_CLUSTER' and the ClamAV detection 'Js.Exploit.Shellcode-18' strongly indicate an exploit attempt. The extracted JavaScript streams, particularly the deobfuscated ones, are likely responsible for downloading and executing a secondary malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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 detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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.
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `46eb0aaba6a45072b4fd332beb2e8ca1e2429e40d14e6f5fd7a8321610c843c9`	pdf-javascript-stream	PDF /JS object 7 at offset 0x297	98624 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `86465197bdff304d381da23193abbce1a46ab310cf9c23342b69a2757b198567`	pdf-javascript-stream	PDF /JS object 7 at offset 0x297	96790 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `7f979a21e6c10302f6d6ecf9e21d71c3877e171561924eaaacb207076c9a2aac`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 7 at offset 0x297	98616 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `7e89f5108aa63c106ce1f6f9f6657430fb5e0ffaf9e139654619edf53464ebb5`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x297	195407 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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