PDF malware analysis — malicious · 0d4a7332b269b4de

MALICIOUS

PDF

238.1 KB Created: 2017-11-20 19:20:55 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: d629bde725eb49ebe415cb8211a21284 SHA-1: 91b62d9efafc5709a315412cbd39da9b7dc392b5 SHA-256: 0d4a7332b269b4de7f90e52915af7ed46e71e025f8dd350003e4ee1a07f10aa3

62 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by heuristics as a suspicious payload. The ML classifier strongly indicates maliciousness. The embedded script is likely designed to download and execute a second-stage payload, a common technique for malware delivery. The benign URL found is not considered a primary IOC.

Machine Learning

Nyx PDF Classifier malicious score 0.9504

Heuristics 4

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.
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.gnu.org/copyleft/gpl.html

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` `31f17486289c481ac95ecfdc8f45e831ebaaeb8f065ab6084f184fd6e5b29f56`	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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