PDF malware analysis — malicious · 1896950a5c37456c

MALICIOUS

PDF

70.1 KB

MD5: 0b182fa66271ba58323f23009f608ad9 SHA-1: 0435d7814e1063231946f536d4213fde292f9dea SHA-256: 1896950a5c37456c8f6d84f97a98f5410402bfa75cc7e287fd31e4d61b7cd9aa

158 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 an unescape function and a custom base64 decoding routine. The decoded JavaScript appears to be a second-stage payload, likely intended to be executed by the PDF viewer. The presence of PDF JavaScript exploit cluster heuristics and the ML classifier strongly indicate malicious intent.

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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://www.bitstream.com
- http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `78b8c1d457e1edd08233be09454f1d7d08b3835cd568802a903de3dbd044b8f4`	pdf-javascript-stream	PDF /JS object 13 at offset 0x10531	3967 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0013_001.js` `c4feb6783df2fe0315afd6fab5aa21c2aebe6d4fce2cc95ef5ddbac86d87a054`	pdf-javascript-stream	PDF /JS object 13 at offset 0x10555	4878 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`font_00_sfnt_off00000352.bin` `a8f4d9b7d604c3c8a0bf3f9a31b9e952d467f98d118fdc784d95d689a14d8a33`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x352	65932 bytes

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