PDF malware analysis — malicious · 4b5525f5cff4b270

MALICIOUS

PDF

103.3 KB

MD5: dc8c2e03d855c5a400a2aa0280b5a8bd SHA-1: 3e797ba84a7631cf1858654436d501a12407a872 SHA-256: 4b5525f5cff4b270a2a0a218ee11f8837ee4d12d2b2581a5f744e875376b1c58

168 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell

This PDF sample was flagged as malicious by an ML classifier with high confidence. It contains embedded objects and uses XFA forms with risky executable scripts, indicating an attempt to exploit vulnerabilities. The presence of PDF_UNESCAPE and PDF_FILTER_HEX heuristics further suggests obfuscation and potential exploit code. No document body text was available for analysis, but the embedded file 'embedded_file_obj0008.bin' is a key artifact.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
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.
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
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_obj0008.bin` `fede3d91f82597f17082cc07cd18151761b47ccd8838b7a3ba440c8b45e3f8cf`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE2	15010 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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