PDF malware analysis — malicious · 8efdfa41372d763f

MALICIOUS

PDF

238.1 KB Created: 2017-12-04 16:09:39 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: 269a2bec2302b791324b709c48216153 SHA-1: 6f03bad0774a0d5b3f7396aca677100c010c45a2 SHA-256: 8efdfa41372d763fcf3c66a5a11548989f4fac5ef50843386d0375e18440535c

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file was flagged by a critical ClamAV detection as Pdf.Dropper.Agent-7281928-0 and a machine learning classifier with a high probability of being malicious. The PDF contains an embedded script payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of the document. The presence of an embedded script suggests the PDF is likely a dropper or exploit document attempting to execute further malicious code.

Machine Learning

Nyx PDF Classifier malicious score 0.9504

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7281928-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7281928-0
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` `4ba72086e6d836c38e594d6c914fbc05e178be9d77d10a3a7b37a26e8f0136d5`	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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