PDF malware analysis — malicious · b8b36cb4b6bd5097

MALICIOUS

PDF

6.7 KB Created: 2011-03-02 10:16:46

MD5: 89320262737093fa8f398ddb6fe37d6e SHA-1: 3f4fe4f523c7bdc880384b16bc36438cefa58ece SHA-256: b8b36cb4b6bd50972247eb637b04c0931cc754bcd5f964de193ff12a98b56260

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains multiple heuristic firings indicating embedded content and risky executable scripts, specifically XFA forms with eval() calls and String.fromCharCode usage. The presence of an embedded file object (embedded_file_obj0013.bin) suggests it's used to deliver a secondary payload. The script execution within the XFA form is the primary mechanism for this attack, likely leading to the download and execution of further malicious content.

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0015.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x288	84 bytes
`embedded_file_obj0005.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x33C	228 bytes
`embedded_file_obj0019.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0x430	199 bytes
`embedded_file_obj0006.bin` `0dcb008ecb92bf211695c0e6ff35353656fe2f667e57eb65f5e6ecfb3aaadbd0`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x524	127 bytes
`embedded_file_obj0016.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x5E8	77 bytes
`embedded_file_obj0010.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x692	56 bytes
`embedded_file_obj0013.bin` `4340804935a869e236f7c754bf69f9f210091cad44fbc9fd42315601c289dfbe`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x9F1	5666 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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