PDF malware analysis — malicious · 98e13440f1ab3358

MALICIOUS

PDF

12.4 KB

MD5: fd6ee7ba21f7f7134d7d1865f0d8c601 SHA-1: c693dc71496ecead4d2cf693490a1f613ea1d386 SHA-256: 98e13440f1ab335834a2ad913bcf5f665be6383ad68f1e14b75fae7e10427bf3

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.007 Command and Scripting Interpreter: JavaScript

The PDF sample contains critical heuristics indicating an XFA heap spray exploit. This exploit is designed to execute arbitrary code, likely by leveraging embedded JavaScript within the XFA form. The presence of an embedded file further suggests a multi-stage attack, where this PDF acts as a dropper for additional malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

Heuristics 6

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0002.bin` `5fdc18a32e421ef0bcc3aeeaf7eb4d8110d37f8d15e318ce546cf26512d1d149`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0x12C2	11551 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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