PDF malware analysis — malicious · b7aa372fb79f708f

MALICIOUS

PDF

292.3 KB

MD5: ed9e0ee16ce91c681c4d954325b0c7f7 SHA-1: 6625916f6415cd03aa4184aee3254ac93e18f3d6 SHA-256: b7aa372fb79f708f3465e7bcc72995cb94d5a4bb541b2f94614506b4d2c245e8

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The ML classifier and multiple PDF-specific heuristics indicate malicious content. The presence of embedded JavaScript, specifically a stream decoded using fromCharCode and ASCIIHexDecode, strongly suggests the execution of a malicious script. This script is likely responsible for downloading and executing a second-stage payload, as indicated by the 'Suspicious extracted artifact' heuristic.

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` `fdf7aed802598566324a13357960234017a3c9787c9e5f9836c6776ce5cbade5`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1CE	99528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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