PDF malware analysis — malicious · 9fb4ee37ede64977

MALICIOUS

PDF

238.1 KB Created: 2017-11-18 17:22:05 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: aeb963950ce4c6573b7886d2a34900ff SHA-1: ca4bc39f8ed5863b7df5017308576168c2bff45d SHA-256: 9fb4ee37ede6497738ea0707ae634e0e052b02e00a208a1788fd076a0b894a12

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-7287851-0'. An embedded script payload was also identified, suggesting the PDF's primary function is to deliver and execute further malicious code. The ML classifier strongly supports its malicious nature. The exact nature of the script's execution is obscured, but its presence indicates a downloader or dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9504

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7287851-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7287851-0
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` `8031dfc6c82173e31c1783999d690fab26a5c9f836d0cf6fc7fcb392b5c5fc4f`	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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