PDF malware analysis — malicious · 5115aaa1daeebc0d

MALICIOUS

PDF

143.2 KB

MD5: e8883c52c9bfee0a65e39f45322d76b5 SHA-1: f199246577d6aa49c34709db8a3b28f383be2479 SHA-256: 5115aaa1daeebc0d35c0e63908e0d1c4f67754c639a41968b03e78ca9297e039

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file exhibits multiple high-severity heuristic firings, including PDF_JAVASCRIPT, PDF_JS, PDF_UNESCAPE, and ML_NYX_PDF_MALICIOUS, strongly indicating malicious intent. The ClamAV detection of 'Pdf.Exploit.Agent-36189' further confirms its malicious nature. Two embedded JavaScript streams were extracted, suggesting the execution of malicious code. The document body is heavily obfuscated and does not provide clear user-facing content, reinforcing the likelihood of a vulnerability exploit. The primary attack vector appears to be the exploitation of a PDF vulnerability to run embedded JavaScript, which likely downloads and executes a second-stage payload.

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` `ccc335e399f75644efe708b7a6ab37480683b8be1b61ec8f43339f5631487c3a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x10531	26261 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `862853d50f6391ba6a7d325b29ab98a2650a713caa57fc0e680fdf07ffb2b2b3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1056D	26269 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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