PDF malware analysis — malicious · c474b56106024bf7

MALICIOUS

PDF

13.8 KB Created: 2010-09-15 17:16:16 Authoring application: wig pec

MD5: 2e629fb52facc66b36e057a99da35c4d SHA-1: 76709563c192f06af6679adb81b10b42693162b7 SHA-256: c474b56106024bf771a21b8b696415e8e2c4d11868b3d4d6f1120e82e66b6d4e

194 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains critical XFA heap-spray exploit code and embedded JavaScript. The presence of PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT heuristics indicates that the document is designed to exploit vulnerabilities within the XFA form processing. The embedded file 'embedded_file_obj0001.bin' is likely the secondary payload. The unescape() call further suggests obfuscated JavaScript is being used to achieve the exploit.

Heuristics 9

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 JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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 0xAC7	84 bytes
`embedded_file_obj0008.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xB78	228 bytes
`embedded_file_obj0006.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0xC68	199 bytes
`embedded_file_obj0010.bin` `e326f43588b78c57514310f82f31cf661e9b47b2e5acd9c8e22682924ea9059e`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0xD59	119 bytes
`embedded_file_obj0002.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xE10	77 bytes
`embedded_file_obj0013.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xEB7	56 bytes
`embedded_file_obj0001.bin` `cb71c8c5659f93be7acf056cf29028746ac14a45fe2ef639460713f9d0610633`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x11ED	24873 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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