PDF malware analysis — malicious · 817c2cd2f487ce33

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6

MD5: fee9db13a1e0b8900e5d21277c64915a SHA-1: c5ed34f172ad69741652076b0a19e58094cda9e7 SHA-256: 817c2cd2f487ce334346c831fe3be6d5674b7a80211921472a9380330906a68c

110 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier, indicating it likely exploits a vulnerability. The presence of XFA form elements and an AcroForm button with an action trigger suggests an attempt to execute code upon opening. While no specific exploit details are available, the overall pattern points to a client-side exploitation attempt, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 5

ClamAV: Pdf.Exploit.Agent-36874 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36874
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
`stream_001_off000008ed.bin` `df2a2e5fbd5d8096e443d7075e7f039f9211cc35d4c2e6bd2b42fb4102b4cade`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8ED	1483 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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