PDF malware analysis — malicious · 799f3086eed237db

MALICIOUS

PDF

242.9 KB Created: 2017-11-19 08:48:11 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: cecb7b23b87d857678ab2bb3ece9c207 SHA-1: 16bd1905eff2c32890db1ec17a08a84e90ff1ef2 SHA-256: 799f3086eed237db9c7342574aaf876df2b949aa3b2880daefa46207ca7fcca6

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-7275045-0' and an ML classifier indicating maliciousness. The presence of an embedded script payload, identified by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic, strongly suggests the document is designed to execute malicious code. The 'PDF_FROMCHARCODE' heuristic further indicates potential obfuscation techniques used within the script. The overall evidence points to a dropper or exploit-carrying PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9247

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7275045-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7275045-0
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_003_off0000cace.bin` `a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xCACE	264072 bytes
`embedded_pdf_script_0003bca4.bin` `8c002d9882788c5ede55758a442afc253ad6ff3cde08e8185db3b2f83ce76f28`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x3BCA4	248755 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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