PDF malware analysis — malicious · fca3ff4008d5f6da

MALICIOUS

PDF

8.9 KB

MD5: d8c28db086d331e3040601795f9e66ab SHA-1: 7d47e34063b1a9b707df3605280d2f42f51d49a3 SHA-256: fca3ff4008d5f6da8de42a6b106ecca3f5920cafb2eb8586e934c7bc927d11b1

106 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream utilizes an eval() call, indicating an attempt to execute obfuscated code. The presence of AcroForm buttons with action triggers further suggests a user-interaction-based lure to execute the malicious script.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0057_000.js` `d1569c10a2a215b275f1b6e2a67e07a265d1d53868b1eb3e40c862abbdeb9985`	pdf-javascript-stream	PDF /JS object 57 at offset 0x191	1591 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`acroform_b64_00.js` `19c8842ae7027bd9591f11395242d18dc7ce7d334d5791a26d9215efffc94c49`	deobfuscated-js	PDF AcroForm base64 (raw) at offset 0xE68	3714 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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