PDF malware analysis — malicious · 3c8c7ef0c724b97f

MALICIOUS

PDF

241.0 KB Created: 2015-08-01 02:35:58 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: 0154c2ef02fd37ded8184e13b958f1be SHA-1: a36f972a2daf3631895a56b39863068eb1189a3c SHA-256: 3c8c7ef0c724b97f9f23a347d141eddd76d500c8a566ed0645b6673c1e267d86

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by heuristics as a malicious script payload. ML classifiers and ClamAV also identified this file as malicious, specifically as a dropper. The embedded script is likely responsible for downloading and executing a second-stage payload, a common technique for PDF-based malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9218

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7251964-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7251964-0
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_off0000bff9.bin` `a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xBFF9	264072 bytes
`embedded_pdf_script_0003b299.bin` `99aea957ca0f3d4106d9e389236552bf5a6d4acaf9e97271c8c8e06d2886c79f`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x3B299	246813 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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