PDF malware analysis — malicious · de1bed9d4ca9428d

MALICIOUS

PDF

14.7 KB Created: 2011-04-08 19:21:08 Authoring application: ooh goy

MD5: 25c69bf086b11af1f088ea3104a93d16 SHA-1: e36fb17c93e0716d67ce06f0041cdadc2ca1479b SHA-256: de1bed9d4ca9428df3743b6f590004bb6df9701a41bdb869cdb9216668f78a68

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

This PDF document exhibits multiple high-severity heuristic firings indicating the presence of executable script within an XFA form. The script utilizes eval() and unescape() functions, suggesting obfuscation and a malicious intent to execute code. The ML classifier strongly flags this PDF as malicious. The primary concern is the embedded script payload, which is likely designed to download and execute a secondary payload, as indicated by the 'embedded_file_obj0008.bin' artifact.

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_obj0013.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x1B57	84 bytes
`embedded_file_obj0017.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x1C09	228 bytes
`embedded_file_obj0015.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x1CFA	199 bytes
`embedded_file_obj0019.bin` `83651bea6c716b2bdfc989106a9e01f55098d53af9b6f64e28463e709cf806d2`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0x1DEC	154 bytes
`embedded_file_obj0005.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x1EBD	77 bytes
`embedded_file_obj0004.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x1F63	56 bytes
`embedded_file_obj0008.bin` `35e2fd9c354ce30d3237955b849cb763c92481916d2627476914106b8d59f224`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x22E3	20392 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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