PDF malware analysis — malicious · cce3b6fd0c831db4

MALICIOUS

PDF

313.2 KB Authoring application: PyMuPDF

MD5: ccc694fd66b1905381fea5b38eba729b SHA-1: 9c7f6f696c24e9399e4fad9e4268bb79f8e34982 SHA-256: cce3b6fd0c831db4e58d5653a1847c70c9a333d1b7e6ba47c637fb7125412d4a

204 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059.001 Command and Scripting Interpreter: JavaScript T1059 Command and Scripting Interpreter T1190 Exploit Public-Facing Application

The PDF file contains embedded JavaScript and exploits a known vulnerability (CVE_2026_34621) in Adobe Acrobat/Reader. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, contributing to the overall attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9620

Heuristics 9

Adobe Acrobat/Reader privileged API chain — CVE-2026-34621 critical CVE exact CVE_2026_34621

PDF JavaScript matches the CVE-2026-34621 exploit chain: Acrobat internal UI/share APIs, swConn prototype/getter manipulation, and privileged RSS or file-read APIs used for staged command-and-control.
ClamAV: Pdf.Exploit.CVE_2026_34621-10060021-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.CVE_2026_34621-10060021-1
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `ac4aa71c501d251717ff180f71d09f948b98863a4f321d6425e972c101ee65c0`	pdf-javascript-stream	PDF /JS object 11 at offset 0x185FA	643 bytes
`acroform_b64_00.js` `30b37c04b7674373a869ca58f4e954426a1eb4b2dcc8e9bc96af01153e15d561`	deobfuscated-js	PDF AcroForm base64 (raw) at offset 0x4AC	73936 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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