PDF malware analysis — malicious · c572cbbce2f5c8d7

MALICIOUS

PDF

238.1 KB Created: 2017-11-18 16:59:52 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: 26095b01d0f844591540228fc079b01e SHA-1: b5ef3b072c28b65ec3f1fb0e00a0e06ed999f06c SHA-256: c572cbbce2f5c8d7e29ed10ba13a12d613efbb1655fd6a021d82ec17aa675df7

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF was flagged as malicious by an ML classifier with high confidence. Static analysis revealed an embedded script payload within a decompressed stream, indicating an attempt to execute arbitrary code. The presence of PDF_FROMCHARCODE suggests obfuscation techniques were used within the script. The primary attack vector appears to be the delivery of a malicious PDF, likely via email, which then executes the embedded script.

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` `5629a2a5f102bcf209410e579f7abf7a52cca9cc87961a8f39521df7f3f8658b`	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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