PDF malware analysis — malicious · 0025aefd9cacb683

MALICIOUS

PDF

242.9 KB Created: 2017-11-18 02:27:03 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: d34857cc8a42d3d3fda0be1a7a251b8d SHA-1: a0edc400c2842aeafea454129fd19793c8f2fc1c SHA-256: 0025aefd9cacb68309548b48a2e7fe9f0cb1826efd8fba778e2497da2424fa0b

62 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains an embedded script payload, flagged by heuristics as suspicious and malicious. The ML classifier strongly indicates maliciousness. While the script content is heavily obfuscated, its presence and the ML classification suggest it's designed to execute malicious code, likely downloading and running a second-stage payload. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9247

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_003_off0000cace.bin` `a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xCACE	264072 bytes
`embedded_pdf_script_0003bca4.bin` `dc899473893c161a6e00a390abff43481168d00508608ab8dfbd7a6df45462fd`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x3BCA4	248755 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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