PDF malware analysis — malicious · 4f1a3db19278fe8f

MALICIOUS

PDF

11.5 KB Created: 2011-01-10 17:29:53 Authoring application: coy ply

MD5: 8f260d6a41867f92b191d7a0d74a8b3f SHA-1: 9bb44c09a7fadedc3f677ffdd2075a9a84c87ff0 SHA-256: 4f1a3db19278fe8f3539c28de4d0a77c8e69495c0ca4348fcae3cce749480ab8

238 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution

This PDF file contains critical XFA heap spray exploit code, indicated by the PDF_XFA_HEAP_SPRAY heuristic. The PDF_UNESCAPE and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics further suggest that the document is designed to deobfuscate and execute embedded malicious scripts. The ClamAV detection of 'Pdf.Dropper.Agent-9448369-0' confirms its malicious nature as a dropper. The primary attack vector appears to be exploiting a vulnerability within the XFA form processing to achieve code execution.

Heuristics 8

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.
ClamAV: Pdf.Dropper.Agent-9448369-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-9448369-0
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_obj0011.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x93A	84 bytes
`embedded_file_obj0017.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x9EC	228 bytes
`embedded_file_obj0019.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xADD	199 bytes
`embedded_file_obj0003.bin` `336a5afc57aa407993e9c57500c623760437a20421ec661b6a84b3b97ff77da2`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0xBCD	119 bytes
`embedded_file_obj0001.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0xC84	77 bytes
`embedded_file_obj0015.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xD2B	56 bytes
`embedded_file_obj0009.bin` `b2c7a466fb4b667db70613019df63595326d664dfd3b9f71bf8533315735fcbc`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x1066	11128 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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