PDF malware analysis — malicious · 65dca34b04416f9a

MALICIOUS

PDF

248.7 KB Authoring application: PyMuPDF

MD5: 1929da3ef904efb8c940679045452321 SHA-1: 7f3c6f97612dd0a018797f99fad4df754e5feb35 SHA-256: 65dca34b04416f9a113f09718cbe51e11fd58e7287b7863e37f393ed4d25dde7

204 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript and triggers a critical vulnerability (CVE-2026-34621) related to privileged API chains. This indicates the sample is designed to exploit a known PDF vulnerability to execute arbitrary code. The deobfuscated JavaScript, though large, likely facilitates the download and execution of a secondary malicious payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 0.9606

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
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://','?language=','/c/windows/system32/ntdll.dll','prototype','status','38AcGcjz','setBytes','stringFromStream','endPriv','activeDocs_count','PKCS#7

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `ac4aa71c501d251717ff180f71d09f948b98863a4f321d6425e972c101ee65c0`	pdf-javascript-stream	PDF /JS object 9 at offset 0x185A8	643 bytes
`acroform_b64_00.js` `b615dd6884acff1127de723e941362df0939bb1709a1ac69f139c926ccf83c95`	deobfuscated-js	PDF AcroForm base64 (raw) at offset 0x33B	74147 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).
`font_00_sfnt_off0003deb8.bin` `c7845420925a23d88ed830a63957b8af85a66a8daf8d9fc90e843673b2ef1a59`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3DEB8	572 bytes

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