PDF malware analysis — malicious · 88707ffd428d10ea

MALICIOUS

PDF

12.5 KB Created: 2011-01-06 13:17:33 Authoring application: heh cos

MD5: df64e5d20988d67218416ffc5508517a SHA-1: b10bf7784e5606f013844915e56df941bd5480fb SHA-256: 88707ffd428d10ea20dcdb1df783b61134ab93a96162ee5d885e7e8e3b08414d

210 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF document contains critical XFA heap spray exploit code, indicated by the PDF_XFA_HEAP_SPRAY heuristic. The exploit is designed to execute malicious scripts embedded within the PDF, likely to download and run a second-stage payload. The ML classifier strongly flags this PDF as malicious, and an embedded file was also detected.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_obj0019.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xD99	84 bytes
`embedded_file_obj0012.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0xE4B	228 bytes
`embedded_file_obj0013.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xF3C	199 bytes
`embedded_file_obj0011.bin` `c0a9b9fb86fa99da52a565fc510b927adefca1cafc0e1f60ea2157743e67f2e7`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x102D	119 bytes
`embedded_file_obj0010.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x10E5	77 bytes
`embedded_file_obj0004.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x118B	56 bytes
`embedded_file_obj0018.bin` `a4ab1d4d45f37afa790d1220c24585b972eaa5a935e57b810a9a802230b0b6a1`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x14C6	11044 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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