PDF malware analysis — malicious · 31edb5f3f59bee53

MALICIOUS

PDF

14.4 KB

MD5: 8734517951aa06ac90a5e0c8c56b00de SHA-1: 2cf1f5f0814b31f7ca87dcf24eba38d6e244f484 SHA-256: 31edb5f3f59bee534715dad5aa81cf6aa26c9cc132a520c5a258dc622709222d

130 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. Specifically, the PDF_XFA_HEAP_SPRAY heuristic indicates the presence of JavaScript heap-spray exploit code within a decoded stream. This script is designed to execute arbitrary code, likely to download and run a second-stage payload. The PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic further confirms the presence of embedded script content.

Heuristics 5

XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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
`stream_000_off00000043.js` `9c5b4692f1075f430ea7ab64fdddf124df9a837f31a1bc6b8ab11078e9da4628`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x43	4194304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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