PDF malware analysis — malicious · a559e3b3dded8e9b

MALICIOUS

PDF

146.9 KB

MD5: e9667a2022a2c7dc175372437e476b42 SHA-1: ad75d1c090cdfab9b9058c973131b6563b6eb0e4 SHA-256: a559e3b3dded8e9bd5f33d38bba621ddcfbbad8139ff2b6a08282a04bf59e575

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The presence of unescape() calls and ASCIIHexDecode filters, along with a high ML classifier score and ClamAV detection (Pdf.Exploit.Agent-36189), strongly suggests exploitation. The embedded JavaScript streams, though large, are likely responsible for downloading and executing a secondary payload. The document body is heavily obfuscated and does not provide clear user-facing content, further supporting a malicious intent through exploitation rather than social engineering.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 8

ClamAV: Pdf.Exploit.Agent-36189 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36189
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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://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` `3bc1e0a72c81db6535437201889e71d11d9fc1efe95b36ba2bb7497ca3296c2e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x10531	27541 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `7ce679b540a6a96e1d456bff80d544b678a28d8303b8a782834dc265b962412b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1056D	27549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`font_00_sfnt_off00000352.bin` `a8f4d9b7d604c3c8a0bf3f9a31b9e952d467f98d118fdc784d95d689a14d8a33`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x352	65932 bytes

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