PDF malware analysis — malicious · a73b8750a307adc6

MALICIOUS

PDF

11.7 KB Created: 2011-05-25 20:38:14 Authoring application: fur nog

MD5: 5998ffd29130084be660c0064631f2eb SHA-1: e5f270a65f02af03a64e4ff5a253ba215dcf31b9 SHA-256: a73b8750a307adc69f6e723fec16985d34cfb708be6164561b64679c3844d310

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains critical XFA heap spray exploit code and risky executable script, indicating it's designed to execute arbitrary code upon opening. The presence of an embedded file, specifically 'embedded_file_obj0019.bin', suggests it's a dropper for a secondary payload. The unescape() call and XFA form exploitation are key indicators of this attack vector.

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_obj0014.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x953	84 bytes
`embedded_file_obj0001.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0xA04	228 bytes
`embedded_file_obj0009.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0xAF4	199 bytes
`embedded_file_obj0003.bin` `40eb8e28e249b479cf4250a6d1585ababc837af3599db31bd26a1d212dd333e2`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0xBE4	119 bytes
`embedded_file_obj0016.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xC9C	77 bytes
`embedded_file_obj0008.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xD42	56 bytes
`embedded_file_obj0019.bin` `63386f50d02a4e95c9571755ff68e1fdef957939e149a651858ed79d09b14830`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0x107D	11381 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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