PDF malware analysis — malicious · 28717b4dc79e9abf

MALICIOUS

PDF

147.5 KB

MD5: 07b71c7b04663b2051d5b45b12c04a46 SHA-1: 8357a30df2a5b9221e5726a6ffe996313800853a SHA-256: 28717b4dc79e9abf4136b4aef7b3aa493e0435a471c5a866b9fbbb658469c44e

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by ML classifiers and ClamAV (Pdf.Exploit.Agent-36189). It contains embedded JavaScript streams which are obfuscated and utilize unescape() calls, indicating an attempt to hide malicious code. The presence of JavaScript actions and XFA forms, combined with the ML and ClamAV detections, strongly suggests the PDF is designed to exploit vulnerabilities and execute arbitrary code, likely to download and run additional malware. The document body content is unreadable and appears to be corrupted or heavily encoded, providing no direct clues to the lure.

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` `9e3b49896d9cbef137b021bf4747f7df329c514092486c4af520b5ff89a285a2`	pdf-javascript-stream	PDF /JS object 13 at offset 0x10531	27749 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `4854076f8879fa0755d5aa5c3a6a6e1c701994868727648afec5a4755b4083f6`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1056D	27757 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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