PDF malware analysis — malicious · 76cda27df5821ce7

MALICIOUS

PDF

12.3 KB Created: 2010-11-30 18:59:29 Authoring application: cod hop

MD5: 334d646a8f3d0fb27867a9d38a4881e0 SHA-1: 3db3c55ab0c1c612bd14e492cf739b7ee38114a9 SHA-256: 76cda27df5821ce78e44f7525818dc6e8aea2a79b4e037dc43d76bb6b8931cce

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file exhibits critical heuristic firings for XFA heap spraying and embedded script payloads, strongly indicating exploit code. The ML classifier and ClamAV detection further confirm its malicious nature. The primary attack vector appears to be an XFA form exploiting a vulnerability to execute embedded JavaScript, likely to download and run a second-stage payload. The embedded file artifact 'embedded_file_obj0006.bin' is likely the secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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-1828800 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828800
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_obj0018.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0xBB9	84 bytes
`embedded_file_obj0017.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0xC6B	228 bytes
`embedded_file_obj0014.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0xD5C	199 bytes
`embedded_file_obj0001.bin` `6f0613fc864020e0bd676680ba61a06e1678fb7fe843eea28b7018d669dc1347`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0xE4C	119 bytes
`embedded_file_obj0002.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xF03	77 bytes
`embedded_file_obj0007.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0xFA9	56 bytes
`embedded_file_obj0006.bin` `6d86864160e175ea582b171fb48447841bcd9bc48b30acb7e8149aec1a39940f`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x12E3	11450 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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