PDF malware analysis — malicious · a90583d08e730d50

MALICIOUS

PDF

292.8 KB

MD5: dca927edbbdcb659d39d41f439e6e09a SHA-1: f2ce0ad85dba42793c39d4b8f4614b75b7594e09 SHA-256: a90583d08e730d505b03eba456de95ba8b545736adfdf3b8b18e5f2ecb55b307

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including ML classification. The JavaScript stream, named 'javascript_obj0008_000.js', is highly suspicious and likely responsible for executing a malicious payload. The use of ASCIIHexDecode filter further indicates obfuscation techniques common in malicious PDFs.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `b4bbe6866c330dda9d62f6eaa6a513322022c96410b5e48f90f84b3461483a0b`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1CE	99672 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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