PDF malware analysis — malicious · 152ebb09c09766a4

MALICIOUS

PDF

162.8 KB

MD5: 8f7c08bff8f2960147edb1dc1d7e41e3 SHA-1: 4165e7e3aef11e2be0836b433045c915a2334a69 SHA-256: 152ebb09c09766a4970319a5f6ce829b5b42455963d896bb55e00a001298c6c6

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains multiple JavaScript streams and XFA form elements, strongly indicating an exploit targeting PDF vulnerabilities. The JavaScript code appears to be heavily obfuscated, but its structure suggests it attempts to download and execute a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 8

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.
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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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.
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0017_000.js` `00d83f0df12dd0145d49c2412a9ed675e811ac74df112e5d8f8ec75f6ce39fa6`	pdf-javascript-stream	PDF /JS object 17 at offset 0x262F8	4690 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0013_001.js` `4fcb53ff79cf0b0954e072193d18fac9274db915419fc585b1d19746b0e345f3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x25C16	1148 bytes
`acroform_b64_00.js` `2dcc302789541914f37753c067c2c4ea2237a5b048127e1f3f24d5698bb1be31`	deobfuscated-js	PDF AcroForm base64 (raw) at offset 0x266FD	2803 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `9dd9beb49566b54eaadcb3224f1212eff06d01dc0da9abf258d22fc8ed291d66`	deobfuscated-js	PDF JavaScript deobfuscation pass	922358 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 14 long base64-like blob(s).

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