PDF malware analysis — malicious · 2e428b6446a48edc

MALICIOUS

PDF

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

MD5: 0e23de57d05e27e4a7100a728859f9ab SHA-1: c77273525e4216365d748f58e2df71b36e58fc5a SHA-256: 2e428b6446a48edcdadfddfb6b1baf81492f863eef0a7b89bad3fad77ea45733

96 Risk Score

Malware Insights

MITRE ATT&CK

T1553.005 Mark-of-the-Web Bypass T1204.002 Malicious File

The PDF contains multiple indicators of maliciousness, including the use of ASCIIHexDecode and JBIG2Decode filters, which are often used to obfuscate malicious content. The ML classifier strongly flagged this PDF as malicious. An embedded file, 'embedded_file_obj0057.bin', was extracted, indicating a likely dropper or exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0057.bin` `3087f467b6f121554a9f91a31ce17815cd947d545f734b3d3984c4e347661375`	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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