PDF malware analysis — malicious · 23406bb0b9dfbd23

MALICIOUS

PDF

14.5 KB Created: 2010-09-14 14:05:22 Authoring application: act gab

MD5: 7271b59b18e8eca57c7449362b4e785c SHA-1: 3d40a4ac55f41f3d4348d2a8b35cb2f34efb21e6 SHA-256: 23406bb0b9dfbd231a2aeb2c54ed1e2fd0ebb86672ff6ec61ac9d95c9149cb83

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.007 Command and Scripting Interpreter: JavaScript

The PDF sample contains XFA (XML Forms Architecture) content, which is known to be a vector for exploits. Critical heuristics indicate PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT, suggesting the presence of exploit code designed to spray the heap and execute arbitrary commands. An embedded file, embedded_file_obj0007.bin, was identified as a suspicious artifact, likely containing the second-stage payload. The exploit code within the XFA form is responsible for downloading and executing this payload.

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_obj0005.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0xAEA	84 bytes
`embedded_file_obj0015.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xB9C	228 bytes
`embedded_file_obj0012.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0xC8D	199 bytes
`embedded_file_obj0013.bin` `e1c1f836ed3189aef8d2f95b936aebafa06f6037abebff0cef22eca1dd506f2e`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xD7E	119 bytes
`embedded_file_obj0002.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xE34	77 bytes
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xEDB	56 bytes
`embedded_file_obj0007.bin` `60720136344f3a4a1f14756e093ee079fdb9ae38c0779c4370378ddfda52cf2d`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x1213	16341 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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