PDF malware analysis — malicious · c513c02789016f59

MALICIOUS

PDF

14.0 KB Created: 2011-04-12 07:02:56 Authoring application: dee kae

MD5: bdf876ddf97a7835de5031b8f5bf809f SHA-1: 1be163969e58ec2d805401512a58bad88f3eaf8b SHA-256: c513c02789016f5935d86ecf6bbfdc3c1e62a0670dbdd54ee518d3576b9008c4

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1071.001 Web Protocols

This PDF sample exhibits multiple high-severity heuristic firings related to embedded scripts and XFA forms, strongly indicating malicious intent. The ML classifier also flagged it with high confidence. The presence of 'eval()' and 'unescape()' calls within a decoded stream suggests JavaScript obfuscation and execution. The embedded script payload and XFA form with risky executable script point towards the execution of malicious code, likely to download and execute a second-stage payload from the embedded file.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_obj0012.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x190C	84 bytes
`embedded_file_obj0010.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x19BE	228 bytes
`embedded_file_obj0003.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x1AAE	199 bytes
`embedded_file_obj0001.bin` `296b548a56e8701a7f81cb93514995154b77158ac5c74c65ec26a45dad369796`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x1B9F	154 bytes
`embedded_file_obj0004.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x1C6F	77 bytes
`embedded_file_obj0009.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x1D15	56 bytes
`embedded_file_obj0018.bin` `19e4ecec9d2d6b055ba60b5391f84b2d4994e311783667cab1538498098d7cb0`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x2097	20452 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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