PDF malware analysis — malicious · 98798aec1faa40ed

MALICIOUS

PDF

399.5 KB Created: 2017-11-18 22:05:23 Authoring application: ï¿½ï¿½Joomla! 1.5 - Open Source Content Management (via ï¿½ï¿½TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: 68b4b628003bd8209c6f1d62f0459b5e SHA-1: 5475b0f36bbc951c6d8b70ba790ee5cde036326f SHA-256: 98798aec1faa40ed76131b08a9c2a95c6c2483635fa2c281f025208bbe338dfd

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-7285120-0' 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 `String.fromCharCode` in the PDF stream further supports the likelihood of obfuscated script execution.

Machine Learning

Nyx PDF Classifier malicious score 0.8638

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7285120-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7285120-0
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_00062f0c.bin` `e82eb103b56fddbb5b07ba768810608dcbe32fa89115be64778a939e5e48cb36`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x62F0C	409115 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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