PDF malware analysis — malicious · d61f3187345cdc8f

MALICIOUS

PDF

13.5 KB Created: 2011-03-29 01:01:08 Authoring application: rug kor

MD5: f1fe388f2e2df7f30a1fbff9ed9920b6 SHA-1: ba842edfc9cc9c49a258921d7d2082c387dcdd2f SHA-256: d61f3187345cdc8f8c41517be10e97c31cadfec97294365e881943ebb8d5d808

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 document exhibits high-confidence indicators of maliciousness, including the use of eval() and unescape() functions within its streams, and the presence of an embedded script payload. The ML classifier strongly flagged this sample as malicious. The embedded file 'embedded_file_obj0002.bin' is suspicious and likely contains the second-stage payload. The XFA form also contains risky executable script, suggesting an attempt to exploit PDF vulnerabilities for code execution.

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_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x1689	84 bytes
`embedded_file_obj0007.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x173A	228 bytes
`embedded_file_obj0009.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x182A	199 bytes
`embedded_file_obj0005.bin` `e6cc2e496b617a933718190dcd93c651ee25225403332e0be49d372c8fad21e7`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x191B	154 bytes
`embedded_file_obj0014.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x19ED	77 bytes
`embedded_file_obj0011.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x1A94	56 bytes
`embedded_file_obj0002.bin` `84622380ef981da170f5d1c1562f00a94ee3c72904b87403bd25c89bb169aa2d`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0x1E16	20444 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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