PDF malware analysis — malicious · b7bc674c74977296

MALICIOUS

PDF

242.9 KB Created: 2018-09-05 06:46:31 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: 345d8be4f31cfe21cccd79ad5f0e2c4d SHA-1: 0035eaedc7258ef4b788ed717acf8dcdf84fe0fb SHA-256: b7bc674c749772967da10d2e587695df430a7a968854ae1c6dcf346319c9dd5f

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged as malicious by an ML classifier with high confidence. Static analysis revealed an embedded script payload within a PDF stream, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The 'PDF_FROMCHARCODE' heuristic suggests potential obfuscation techniques used within the script. The primary attack pattern involves leveraging the embedded script to execute malicious code, likely for downloading and running further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9247

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_003_off0000cace.bin` `a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xCACE	264072 bytes
`embedded_pdf_script_0003bca4.bin` `6885312a84705260d2026e9333f5ea62684dd380ec2768807cee35223545c36e`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x3BCA4	248755 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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