PDF malware analysis — malicious · 445ee22eb788a6d0

MALICIOUS

PDF

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

MD5: f8ea75a1a7399f2c312a5c83de036878 SHA-1: e3401c3bfb0165140b97a1d85cb47896eb98bf01 SHA-256: 445ee22eb788a6d0c96bc0e53fdc669c94b96c3471d518de10334d628040b497

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains multiple indicators of malicious intent, including the use of ASCIIHexDecode and JBIG2Decode filters, which are often associated with exploit delivery. A machine learning classifier also flagged this PDF with high confidence. Furthermore, an embedded file was extracted, suggesting a multi-stage attack. The presence of these indicators strongly suggests the PDF is designed to exploit vulnerabilities and deliver a secondary payload.

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` `5d78cbf4ab99a91d3e485680ae1b177ec112f6b6c6e2d5ba790a0b542a0b8de8`	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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