PDF malware analysis — malicious · 10c9661ab13192a8

MALICIOUS

PDF

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

MD5: a9eb07a99688f0bb466951882f7a5dec SHA-1: 214c9a7a514460b729ba18a0eb04cafb3cd83e16 SHA-256: 10c9661ab13192a8c7002ece742a0c1ca90e67877c4c776ba9ec73f80ac6332e

98 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains multiple indicators of maliciousness, including embedded files and exploit-related filters. The ML classifier strongly suggests malicious intent. While no specific document body text or scripts were extracted, the presence of an embedded file and exploit indicators points towards a downloader or dropper functionality, likely delivered via spearphishing.

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` `520828f588fa1dedeb00801578591622f2b3da591252375500c9f9263da655bc`	pdf-embedded-file	PDF EmbeddedFile object 57 at offset 0xDD3	1230 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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