PDF malware analysis — malicious · a55bef2dc030b3c3

MALICIOUS

PDF

12.6 KB Created: 2011-04-20 06:39:50 Authoring application: yup axe

MD5: 9061359089c19823959d23861e3eeb20 SHA-1: 80788dcde31226315c217aae874232af2a65e542 SHA-256: a55bef2dc030b3c38b0871add2c50c0c02480059c5e6b6133977c3f2346add53

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains multiple high-severity heuristic firings indicating the presence of executable script and embedded files. Specifically, PDF_EVAL and PDF_UNESCAPE suggest JavaScript execution, and PDF_XFA_SCRIPT confirms risky executable script within an XFA form. An embedded file, 'embedded_file_obj0015.bin', was also extracted, which is often used to deliver secondary payloads. The script execution and embedded file strongly suggest this document is designed to download and execute further malicious content.

Heuristics 8

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)
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
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x1330	84 bytes
`embedded_file_obj0018.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x13E2	228 bytes
`embedded_file_obj0004.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x14D2	199 bytes
`embedded_file_obj0005.bin` `e6bb85ae0ec2c5672f7c0ca6f3c60f8529348f88b4f9384b7a64309d6d11f4c0`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x15C3	154 bytes
`embedded_file_obj0011.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x1694	77 bytes
`embedded_file_obj0002.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0x173A	56 bytes
`embedded_file_obj0015.bin` `95efbc5154c5bf0127e11b2c601f468337365afcf4e53036b67a31a5e2dc1bf9`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x1AB8	20583 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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