PDF malware analysis — malicious · 524934d0da9bc18e

MALICIOUS

PDF

238.1 KB Created: 2017-11-29 18:42:37 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: 8973b2f2e26d003f184cf392cb8a2d44 SHA-1: 661c14475fbae9748b2d1972a6df68e0ed4ee225 SHA-256: 524934d0da9bc18e391a522f142bada21abcd77e433802f498ff5b2b48dd3529

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged by a machine learning classifier as malicious and contains an embedded script payload. The script is obfuscated, making its exact function difficult to determine, but it is highly likely intended to download and execute a second-stage payload. The presence of PDF-specific heuristics like PDF_EMBEDDED_SCRIPT_PAYLOAD further supports this conclusion.

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` `919e0d533dd2ce54f0c1470e67b1f5563bf896437dabb01989ca146476c4686c`	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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