PDF malware analysis — malicious · 0803890cdf53877d

MALICIOUS

PDF

83.7 KB

MD5: f126c9b18b462d0d26b2d177757f25a7 SHA-1: 2b13968889547bd84ba7252e8310d6170486a86c SHA-256: 0803890cdf53877d28de1d09b7d5e5d529761176821f44fc4c411cf3075d8563

146 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that is heavily obfuscated, but analysis indicates it is designed to exploit a vulnerability and execute code. The script attempts to download and execute a second-stage payload, as evidenced by the ML classifier and exploit cluster heuristics. The presence of JavaScript and exploit indicators strongly suggests a malicious intent to compromise the user's system.

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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0002_000.js` `00d83f0df12dd0145d49c2412a9ed675e811ac74df112e5d8f8ec75f6ce39fa6`	pdf-javascript-stream	PDF /JS object 2 at offset 0x12F63	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).
`acroform_b64_00.js` `2dcc302789541914f37753c067c2c4ea2237a5b048127e1f3f24d5698bb1be31`	deobfuscated-js	PDF AcroForm base64 (raw) at offset 0x13367	2803 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `21ebbd7fb4a2a477efeeaf8ea5f3bbe83dafcd6c679b572f2f5dbb284f31fbb8`	deobfuscated-js	PDF JavaScript deobfuscation pass	588530 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).

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