PDF malware analysis — malicious · 75a61a3b15ac191e

MALICIOUS

PDF

70.1 KB

MD5: 697c011c689f4fe3cfc1913022cbd7f9 SHA-1: a9c774b01d7ff16e20653bbfde7e7082b1eabf4f SHA-256: 75a61a3b15ac191e5fd9f2edcd3eab362b410105002f287a029b80e9b9467a31

158 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file that contains embedded JavaScript, which is heavily obfuscated and utilizes the unescape() function. This JavaScript is designed to exploit a PDF vulnerability, likely to download and execute a secondary payload. The presence of the PDF_JS_EXPLOIT_CLUSTER heuristic firing strongly supports this conclusion. The obfuscated JavaScript reconstructs a URL from concatenated strings, which is a common technique for malware to hide its download source.

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` `cbcef4436803a70c172f9e5edec8560a7f3f425ad8d350ca7d64d4de24ef273e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x10531	3979 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` `cb10a7c87a3cfeebef0ab9a1f92ae44c53fc9f663bba71fdac27b04adc7631d3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x10555	4890 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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