PDF malware analysis — malicious · d5141394d5e86890

MALICIOUS

PDF

238.1 KB Created: 2017-11-20 18:08:39 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: ce93d7f5b5c780ba1511dd1daa5e1e67 SHA-1: 5d508618f93f0de0029f2f5c5556c4131614d0ee SHA-256: d5141394d5e86890bd3cb33c1aed119d6da167911395a608f18451eb1a3a29ea

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier as malicious and contains an embedded script payload. The presence of the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic and the ML_NYX_PDF_MALICIOUS firing strongly indicate that the script is intended to deliver a secondary payload. The script's obfuscation and the ML model's high confidence score support this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9504

Heuristics 3

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` `f7026cd67065631b2c68f0af5749422638eba4a95107487c0ccdcfeae7159e9d`	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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