PDF malware analysis — malicious · 46fc4be1905383e5

MALICIOUS

PDF

238.1 KB Created: 2017-11-25 08:31:44 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: cb44ea91c2412bee90fd68a5b87eb846 SHA-1: 8008bad89782fb46c46b931a6beebf7ec19fa86d SHA-256: 46fc4be1905383e530aabe9e02994076165f73db01507d218cb540c160cc79ce

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged by a machine learning classifier with a high confidence score and also triggered heuristics related to embedded script payloads and string obfuscation. The presence of embedded scripts suggests an attempt to execute malicious code, likely for downloading and executing a second-stage payload. The ML_NYX_PDF_MALICIOUS heuristic indicates a strong likelihood of malicious intent.

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` `5bf01cee9c6b5e4087b7c01a14b13947c11c13291c8025f88f3aa7b417953b98`	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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