PDF malware analysis — malicious · 0aed7e260456e9f0

MALICIOUS

PDF

238.1 KB Created: 2017-11-18 17:50:07 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))

MD5: de9c38023a5091ec06ac21d7f751520a SHA-1: 922b3885bcd4fef7e2e5733cc829aae592e67182 SHA-256: 0aed7e260456e9f09d0932d50a726cbbf61e410de09eb49a0375d93a7b7a44e2

122 Risk Score

Malware Insights

MITRE ATT&CK

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

The file was detected by ClamAV as Pdf.Dropper.Agent-7227177-0 and flagged by an ML classifier, indicating malicious intent. Embedded script markers and heuristics like PDF_EMBEDDED_SCRIPT_PAYLOAD suggest the presence of a script designed to execute malicious code, likely exploiting a PDF vulnerability. The benign URL found is unlikely to be related to the malicious functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9504

Heuristics 5

ClamAV: Pdf.Dropper.Agent-7227177-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7227177-0
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.
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` `91368653dd2c5eb2d5df00eef7199eceffc1c69124af55d81d04c46af9fff7e2`	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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