PDF malware analysis — malicious · 530b05484980a1ef

MALICIOUS

PDF

238.1 KB Created: 2017-11-20 19:19:30 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: a05111c97aca681ada697aa385dd63ed SHA-1: 6d91035e7c727682c3afbc68f559cdcbccf00df0 SHA-256: 530b05484980a1ef31a81ef198228eb073cb6f3b1c5f66962ecea8b4217305eb

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 high confidence (0.95) and also triggered heuristics related to embedded script payloads and the use of String.fromCharCode. The presence of an embedded script payload, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic and the 'embedded_pdf_script_0003a937.bin' artifact, suggests the document is designed to execute malicious code. The exact nature of the script's execution is not fully detailed, but its presence is a strong indicator of malicious intent, likely for delivering a second-stage payload.

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` `69ae7949a34f734a459c5b9df8b9450cb482a3f165adc4967779f862587344ab`	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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