PDF malware analysis — malicious · 3824afa4dd811922

MALICIOUS

PDF

18.9 KB

MD5: e177bbfac1877abb1c7291b76e9c9af0 SHA-1: 7653675260755644a42b596c9f0b672d519bbd9f SHA-256: 3824afa4dd811922f7081014c04bca42a5f82cf4d67ddd35327a159620e7d237

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF sample contains critical heuristics indicating an XFA heap spray exploit. This exploit is designed to execute JavaScript, which is further supported by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' firing. The embedded file 'embedded_file_obj0010.bin' is likely the secondary payload. The ML classifier also flagged the PDF as malicious. The exact intent of the script is not fully discernible due to obfuscation, but it is highly probable that it downloads and executes a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.5950

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.
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.
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 (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x16F7	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x17A8	228 bytes
`embedded_file_obj0010.bin` `238bdd4f63aec181a15b3d9afa872ce84b745a59add1fb3f230c2d11e5b78c88`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x189B	28580 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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