PDF malware analysis — malicious · 210f18e43ffe7dd5

MALICIOUS

PDF

3.3 KB

MD5: 6f2c20e886cc37610efd608d1cfc05ba SHA-1: 481950e8527a9291cc3838182ec45da7f05e6777 SHA-256: 210f18e43ffe7dd512664b4a1eb9514ef28f7b2c706b6b4d5e95a6b32829f880

258 Risk Score

Malware Insights

MITRE ATT&CK

T1041 Exfiltration Over C2 Channel T1071.001 Application Layer Protocol: Web Protocols T1204.002 Malicious File: Malicious File

The embedded JavaScript attempts to read the system's hosts file using `util.readFileIntoStream` after elevating privileges with `app.beginPriv()`. It then exfiltrates the data in chunks over HTTP to `http://192.168.56.1:45191/exfil`. This behavior is indicative of an information-gathering or credential-stealing stage.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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.
Prototype-pollution JavaScript pattern high CVE related PDF_JS_PROTOTYPE_POLLUTION

PDF JavaScript mutates object prototypes while also referencing privileged or sensitive PDF APIs. This tracks a modern PDF exploit technique family without assigning an unverified CVE.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0003_000.js` `0373cb0dc4caa1f6bf28c1f9227e7e68b211f167f7cb51967a745b61b870c9e7`	pdf-javascript-stream	PDF /JS object 3 at offset 0x9B	2706 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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