PDF malware analysis — malicious · d223b415e3a663fe

MALICIOUS

PDF

12.4 KB

MD5: d38f42196c3a727a0fb5ddbf24aed31d SHA-1: 916ab2c3d3d6a2e49becb552dd0617b7a5e175e7 SHA-256: d223b415e3a663fe79293b0bdd672bdfd9377876c3a8b67fe51ee0bfdb0fdae0

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious PDF

The PDF sample contains critical XFA heap spray exploit code and risky executable script, indicating it's designed to exploit vulnerabilities. The ML classifier strongly flagged this PDF as malicious. The presence of embedded files, particularly 'embedded_file_obj0002.bin', suggests it's a dropper for a secondary payload. The exploit code likely attempts to download and execute this payload.

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.
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
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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0017.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0xB98	84 bytes
`embedded_file_obj0015.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xC4A	228 bytes
`embedded_file_obj0009.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0xD3A	199 bytes
`embedded_file_obj0016.bin` `b3b4cb74b68cc23d0d2da2d59abcfb686bb37f6170c139beef39fe1b6f149885`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xE2B	119 bytes
`embedded_file_obj0012.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0xEE1	77 bytes
`embedded_file_obj0013.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xF88	56 bytes
`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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