PDF malware analysis — malicious · bc54b8661f17ab58

MALICIOUS

PDF

1.6 KB

MD5: 1131b256a605f57c667e0cde26a483c4 SHA-1: fc25b59228f069c678bda6b8ffb12abda88203a1 SHA-256: bc54b8661f17ab5864f845a22a34b50cd6c989e6b56511352751756895df26a9

106 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.007 Scripting: JavaScript

The PDF file contains embedded JavaScript that attempts to save a file to the Windows Temp directory as 'sGYB.hta' and then likely execute it. The script utilizes 'Microsoft.XMLHTTP' and 'ADODB.Stream' objects, common for downloading and writing files. The embedded URL 'http://10.0.0.5:8080/sGYB.exe' is the likely source for the second-stage payload. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
Suspicious extracted artifact medium 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.
JavaScript action low 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 URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://10.0.0.5:8080/sGYB.exe

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `c360d209ce71dbdd506786f45854d04dce242c6e77315b497b76a88fcc8b4ac3`	pdf-javascript-stream	PDF /JS object 1 at offset 0x434	181 bytes
`javascript_obj0001_001.js` `2d910100eb1444a1e0bf5a041a1f9f484ae8841e8209f504f080c49289e665c7`	pdf-javascript-stream	PDF /JS object 1 at offset 0x434	84 bytes
`embedded_pdf_script_000002a9.bin` `4ad0f189269e1ab77cc3350732d3502c929f9bc42d3f176c52d4c558fb044f36`	pdf-embedded-script	PDF raw stream script payload at offset 0x2A9	955 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s).

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