PDF malware analysis — malicious · d505a0a1c4f1fe85

MALICIOUS

PDF

2.2 KB

MD5: f7853ac8b1a84a430a24a5dfce078152 SHA-1: 605a5bc660e70bcd73e7aa59c98960487bd3e273 SHA-256: d505a0a1c4f1fe8564e4748fb8a7ddd657bccc35882eef7c07c4d42c70285d08

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1027 Obfuscated Files or Information T1204.002 Malicious File

This PDF sample was flagged as malicious by ClamAV (Pdf.Exploit.Agent-36082) and a machine learning classifier. Static analysis revealed embedded JavaScript streams containing obfuscated code, including calls to eval(), unescape(), and String.fromCharCode(). These techniques are commonly used to hide malicious actions, such as downloading and executing further payloads. The primary intent appears to be the execution of this obfuscated JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36082 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36082
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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. (matched inside decoded stream)
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_obj111611_000.js` `772da696bdb365f3f1eb4ea6af881baad391be62f3591b19f2f9827fcc4c9b53`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x7D6	479 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `b9fb11d4696b3a8130fe9cb0c2ee1dd1b4a112e71f4b6852389baa23528b7f8c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2816 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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