PDF malware analysis — malicious · faaf26059b9143fb

MALICIOUS

PDF

70.1 KB

MD5: 2d7a3dd77d18cce5635135de3b319bf4 SHA-1: 1c20a3be818b69c77c2d26fdd0af6f33471d1502 SHA-256: faaf26059b9143fb7a3fbcc88b040c57811bb00c4dfa9cdf9a6478b38f826799

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flagged this PDF as malicious. The presence of unescape() calls suggests obfuscation of malicious JavaScript code. The embedded JavaScript files, javascript_obj0013_000.js and javascript_obj0013_001.js, are likely responsible for executing the malicious payload. The document body content is heavily obfuscated and does not provide clear user-facing text.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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` `290a4b00d6af99f8c3bbf9f3bb969e3eeecf6a6b02ba06e238ec7fb88e9a386c`	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` `57a8a2052ef47550dde215a4ba7dcf3281234ae268fa19a9e34e68383873b81d`	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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