PDF malware analysis — malicious · a04a9506dd8d3339

MALICIOUS

PDF

238.1 KB Created: 2017-11-18 15:34:57 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: 1031069a4b6d7c8a88ee530f5ccb6b60 SHA-1: 2d70161f800b71ffd45dbd485cd01b5950a5a8a8 SHA-256: a04a9506dd8d3339a2b55c92a8c07246c26d13f03843277351bdac9baeb06946

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Dropper.Agent-7288068-0', and an ML classifier indicating maliciousness. An embedded script payload was also identified, suggesting the PDF's primary function is to download and execute a second-stage payload. The presence of PDF_FROMCHARCODE and PDF_EMBEDDED_SCRIPT_PAYLOAD rules further supports this. The exact nature of the embedded script could not be fully determined due to obfuscation, but its presence is a strong indicator of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9504

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7288068-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7288068-0
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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_002_off0000b783.bin` `a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB783	264072 bytes
`embedded_pdf_script_0003a937.bin` `3213164e7ea1772b8df508501ee18a57b66fb3c825a5fce8a232e4bd16d8c3bf`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x3A937	243782 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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