PDF malware analysis — malicious · 6d7b310894b368c5

MALICIOUS

PDF

15.7 KB Created: 2011-11-14 16:08:31 Authoring application: FPDF 1.6

MD5: 0e4d8df7f21a3661b9aae5bad26f7191 SHA-1: 0b8a9e8220460f037065ea8dc1eaa6c6feead811 SHA-256: 6d7b310894b368c5d65d0a46ab727860edb515cef84480f3fc90d26ae1a4fe2b

98 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF sample was flagged as malicious by an ML classifier and exhibits several suspicious characteristics, including embedded files and the use of ASCIIHexDecode filters which can be indicative of exploit code. The presence of an embedded file suggests an attempt to deliver a secondary payload. While no specific family is identified, the techniques used point towards a common method for distributing malware via malicious documents.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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.xfa.org/schema/xfa-data/1.0/
- http://ns.adobe.com/xfdf/
- http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0057.bin` `b61c83cf10febe9fc025be953fa09da9875bb35c7d4d9d05aeb075f8be92cb2c`	pdf-embedded-file	PDF EmbeddedFile object 57 at offset 0xDD3	1216 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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