PDF malware analysis — malicious · 4284506a9b4d30cd

MALICIOUS

PDF

299.2 KB Created: 2017-12-03 11:31:05 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: 245e15c86005433d36a257bb8b6492f7 SHA-1: fd8814cc783a5f17b3a0cc4b90ace51b04408043 SHA-256: 4284506a9b4d30cd420bd99afd343844afef0fe637950efebf5c5fa52242506e

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The critical ClamAV heuristic firing indicates this PDF is recognized as a dropper, specifically 'Pdf.Dropper.Agent-7254746-0'. The PDF contains an embedded script payload, as flagged by a medium heuristic, which is a common technique for delivering secondary malware. The 'String.fromCharCode' heuristic suggests obfuscation within the script. The overall pattern points to a malicious PDF acting as a downloader for further malicious activity.

Machine Learning

Nyx PDF Classifier clean score 0.1248

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7254746-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7254746-0
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_004_off0000c1fd.bin` `a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xC1FD	264072 bytes
`embedded_pdf_script_00049dc5.bin` `36f14fc62073ad3b9f9dbe313e33dea9c0c4f664310a70b0a89a49bad4d2bb66`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x49DC5	306388 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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