PDF malware analysis — malicious · a04938d6d0ff1c11

MALICIOUS

PDF

238.1 KB Created: 2017-11-29 18:40:48 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: 196a9228b45cdac38f5df532d1ef5cd4 SHA-1: e9aa2e0b6734f3b3ad40efa297b5ba5ca36bb75d SHA-256: a04938d6d0ff1c119921dc0ff22e588fd045558f17e553325b06195cd5dc85bf

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-7288070-0' and an ML classifier indicating maliciousness. An embedded script payload was identified, suggesting the PDF's primary function is to download and execute a second-stage payload. The presence of 'String.fromCharCode' and obfuscated script indicators further supports this. The authoring application 'Joomla! 1.5' is not directly indicative of the malware's behavior but may suggest a compromised web server was used for distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9504

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7288070-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7288070-0
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` `82122b25c93869ba64e2240cdd2d162edc965d8d1ec33bc2ec662f9446b20d32`	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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