PDF malware analysis — malicious · 1c502f6578290eda

MALICIOUS

PDF

14.7 KB Created: 2011-04-17 10:04:09 Authoring application: mug rut

MD5: d6c23ea9c2ddaed2a47c0bc94faa4790 SHA-1: 6a15c8673d91066df8e32fc7cd5d89af739f7d19 SHA-256: 1c502f6578290edada66a67ac8f7f779d272a61a4142ca283791caabb88121d9

196 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF document contains embedded JavaScript that utilizes eval() and unescape() functions, indicating a malicious intent to execute code. The ML classifier strongly flagged this PDF as malicious. The presence of an embedded file, specifically 'embedded_file_obj0014.bin', suggests it's a dropper for a secondary payload. The document body text is heavily obfuscated and appears to be a mix of encoded data and potentially decoy strings like 'mug rut', which is also listed as the authoring application.

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_obj0011.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x1BDE	84 bytes
`embedded_file_obj0006.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x1C8F	228 bytes
`embedded_file_obj0004.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x1D7F	199 bytes
`embedded_file_obj0018.bin` `8f568efe11108d4040344176d8c6ad1fe7f9bad0cb673f79db82ab76099beb21`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x1E71	154 bytes
`embedded_file_obj0019.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0x1F43	77 bytes
`embedded_file_obj0003.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x1FE9	56 bytes
`embedded_file_obj0014.bin` `738b0193962e12bc28ddb6bf483a452761c384372b2d33d3aacff5e0ec3ae388`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x2367	20284 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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