PDF malware analysis — malicious · b574f15a7ad521b7

MALICIOUS

PDF

241.4 KB Created: 2014-01-17 12:35:01 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: 4184d914ad786994fa0b9ceea98b5bd4 SHA-1: bac9240bebbf60d18aa570c6705cc77fe14daabf SHA-256: b574f15a7ad521b77a0b6d9ae6446dd987bd959e686512999e0d4f35d5ecbf19

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. The ML classifier also flagged this PDF as malicious with a high score. The embedded script, named 'embedded_pdf_script_0003b3f4.bin', is likely responsible for executing the malicious payload, although its exact function is obscured.

Machine Learning

Nyx PDF Classifier malicious score 0.9218

Heuristics 3

Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
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.
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
`stream_003_off0000c15a.bin` `a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xC15A	264072 bytes
`embedded_pdf_script_0003b3f4.bin` `4b58c69732e831093f63b037d01f1249d10738fe140692db11f8f42d75abaa72`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x3B3F4	247160 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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