PDF malware analysis — malicious · 583acc59229c0e82

MALICIOUS

PDF

239.0 KB Created: 2017-12-01 09:04:13 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: c33eff795938aa520dbf1a32fe0d7267 SHA-1: 937ca00b408c6815e29b80c930b7a78bcc99bc0f SHA-256: 583acc59229c0e825aecea3df550beba5c286e4317f9b6d49f1fc2e2424ce8a9

62 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains embedded scripts and external URIs, indicating a malicious intent to redirect users to potentially harmful websites. The ML classifier strongly flagged this PDF as malicious. While no specific family was identified, the presence of embedded scripts suggests an attempt to download and execute further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 5

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.
External URI info PDF_URI

PDF contains an external URL action
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.lnt.eng.br/armacon.html
- http://www.multcalc.com.br/calcvigas.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000bb4a.bin` `a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xBB4A	264072 bytes
`embedded_pdf_script_0003acfa.bin` `450afcb1f340477d8d35ad90e40aca0d330cf2fd20236c18b8e55891af221b5c`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x3ACFA	244745 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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