PDF malware analysis — malicious · 65f32991252a9008

MALICIOUS

PDF

48.7 KB

MD5: 8531a183eadab93422edc20896406645 SHA-1: 3a16167a06a7a11dd2b011d9abb8e271b77a29fd SHA-256: 65f32991252a9008129ee593482d915b784997a1eddf64e1ba4de3e360516e20

138 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that is heavily obfuscated. The script appears to deobfuscate a string and then execute it, likely to download and run a secondary payload. The presence of PDF_XFA and PDF_JS_EXPLOIT_CLUSTER heuristics indicates a known exploit pattern targeting PDF vulnerabilities. The ML classifier strongly suggests maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `e24248f148cf6303b2bce4098f4f285f43e5f88a71256ff4983898538262b5bf`	pdf-javascript-stream	PDF /JS object 12 at offset 0x9405	604 bytes
`stream_002_off0000962e.bin` `070732b3fbbd20295c5b1a911789c30af5b99ce5e14e004bbedc5acf7f113122`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x962E	449 bytes
`stream_003_off00009a55.bin` `aa3f131d6543bfd8c261d6ca4016ff261926ace1cc695ffa0486ba87f8badb09`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x9A55	14536 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`font_00_sfnt_off0000033b.bin` `4e56128afad897c8ba22338709048333a61f0c1c8de4785f90267c2edf4d9a4e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x33B	58553 bytes

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