PDF malware analysis — malicious · 9fabdf48df9ece9e

MALICIOUS

PDF

12.7 KB Created: 2010-11-12 18:57:27 Authoring application: tom ebb

MD5: c9ac4d4d3f71c692dc5493a5d6a7a25a SHA-1: d98426e65d23256c5541c2352c053a5b3321996e SHA-256: 9fabdf48df9ece9e957d8f90d880e434081ea9aecf129ad0440a262593b4d400

268 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution

This PDF sample utilizes XFA form features to trigger a heap spray exploit, as indicated by the PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT heuristics. The embedded file, likely a secondary payload, is also noted. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a dropper. The exploit targets a known vulnerability in how XFA forms handle JavaScript, leading to arbitrary code execution.

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-7287810-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7287810-0
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_obj0015.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xE37	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0xEE8	228 bytes
`embedded_file_obj0013.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xFD9	199 bytes
`embedded_file_obj0001.bin` `7a7b7de1b442c21c7622c6e5c150dce4e8167115b9ef9aeb057df04b92f06a6a`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x10C9	119 bytes
`embedded_file_obj0010.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x1181	77 bytes
`embedded_file_obj0003.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x1227	56 bytes
`embedded_file_obj0007.bin` `0b2ecb5df3e7bc2525910157c9a0e3f54029164d9818b11e03bdd01748e89df8`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x1561	10975 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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