PDF malware analysis — malicious · 9d4bb85ab8c3f2aa

MALICIOUS

PDF

190.4 KB

MD5: f45256cbe9a6fbbf27fce532d807d080 SHA-1: 0c0f95ec1eae6f23bbfadd980dce7408c60ad4f6 SHA-256: 9d4bb85ab8c3f2aaf3c3de7ebee89115f47cd3080b1c5fc863c65936f995496a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The script utilizes eval() and String.fromCharCode, suggesting obfuscation and dynamic code execution. The ML classifier also flagged this PDF as malicious. The primary intent appears to be downloading and executing a second-stage payload from a remote source, as evidenced by the obfuscated JavaScript streams.

Machine Learning

Nyx PDF Classifier malicious score 0.5905

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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. (matched inside decoded stream)
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_008_off000056c7.js` `49cf54e6dea124d681e9320255e750611e4abc318a44c2233c42b58d59afe90c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x56C7	1388 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s).
`objstm_0328_00.bin` `d833519188db849a6bb41c8fe06ee4e2f824ce08d000b6975932ae19823d8ceb`	pdf-objstm-decoded	PDF /ObjStm 328 0 obj (inflated)	4671 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`objstm_0174_00.bin` `641cbb7db431b49e363d77b146bc86dc1718700710e0762ded3be006009168bf`	pdf-objstm-decoded	PDF /ObjStm 174 0 obj (inflated)	784 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.