PDF malware analysis — malicious · e4b8b952886c295a

MALICIOUS

PDF

239.0 KB Created: 2017-12-03 11:31:27 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: e17b4133e318949c358849970d8da4d0 SHA-1: 12aa7cea715177f5d4f61cc8cacc6f0cd6d27fe8 SHA-256: e4b8b952886c295a2fd2238d3b8f2cff7aea93eda0da4bad5be7349976aa87d9

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. The embedded script payload suggests an attempt to download and execute further malicious content, though its exact function is obscured by obfuscation.

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` `51576eccd79ff877c16cb5c8b99e00641c0f2a31b8e8299a6886526622a394c6`	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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