PDF malware analysis — malicious · b81fc65019592d40

MALICIOUS

PDF

12.6 KB Created: 2011-04-14 15:06:03 Authoring application: gap gar

MD5: 4c4284ae2e09ffa31498da6c49b21e3a SHA-1: 73e924eacb9347df5529cbb5ae94e14dc9c2b483 SHA-256: b81fc65019592d40d6b2ed899bba391faf64d1e589a884f2de7333914636c658

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 form elements with JavaScript that triggers a heap spray exploit. This exploit is designed to execute arbitrary code, likely to download and run a secondary payload. The presence of embedded files, particularly a large one identified as suspicious, further supports this attack vector. The specific exploit targets XFA heap spray vulnerabilities.

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_obj0007.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0xC69	84 bytes
`embedded_file_obj0013.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xD1B	228 bytes
`embedded_file_obj0019.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xE0C	199 bytes
`embedded_file_obj0011.bin` `131b4a751a20d93d56a1bfb8b223bba388ec90d4721c8430948b5b43510f18c1`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0xEFD	119 bytes
`embedded_file_obj0014.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0xFB5	77 bytes
`embedded_file_obj0005.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x105B	56 bytes
`embedded_file_obj0015.bin` `95d7b0012a5c5d6cb37306e3e219f0b073efbaff01bdc5af3d8be449e1b9f340`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x1397	11759 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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