PDF malware analysis — malicious · 06fdaec8a5eaa5cc

MALICIOUS

PDF

153.4 KB Authoring application: Aspose Ltd. (via Aspose.PDF for .NET 19.8) First seen: 2021-03-01

MD5: 48b6684dd214ef07ffb06ac51dc27a22 SHA-1: a28627361400f6e98a0094a424bcf6297d5fb46f SHA-256: 06fdaec8a5eaa5cc079fe0329b7a1b06e63f9d970c91544172d9abe0e7f16b43

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains an embedded Windows executable payload that is masquerading as a PDF document, indicated by the 'template.pdf' filename and the mismatch between declared and sniffed content types. This is a common technique for delivering malware via email attachments. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

Nyx PDF Classifier clean score 0.1664

Heuristics 5

Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCH

An /EmbeddedFile attachment's declared filename extension or /Subtype MIME type contradicts the magic bytes of its decompressed content. The attachment is declared as a benign document or image but the bytes are an executable or executable-bearing archive. This is a deliberate deception used to hide droppers in PDF attachments and is a generic indicator of embed-and-drop weaponisation, independent of any specific CVE.
Suspicious extracted artifact medium 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 file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`template.pdf`	pdf-embedded-file	PDF EmbeddedFile object 27 at offset 0x142B2	285696 bytes
SHA-256: `b62281ddc4a2778cc1929924c6bf9262a5a5d5b1a238939f53a2639577caf74a`
Detection ClamAV: No threats found Obfuscation or payload: likely actual_type=PE; declared_or_context_type=PDF; filename=template.pdf; kind=pdf-embedded-file

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