PDF malware analysis — malicious · 1c52fea568a253f7

MALICIOUS

PDF

13.1 KB Created: 2010-11-18 15:34:40 Authoring application: ski box

MD5: 15fae6691dccfd0742c348c3682e06ee SHA-1: 18105612dc9af1db67c530e23015bd62dbae86fb SHA-256: 1c52fea568a253f7dcc6d5c5d0dbcd70b1aa73a7a6c4800764835517ed989772

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample triggered multiple high-severity heuristics related to embedded scripts and XFA forms, indicating a deliberate attempt to execute code. The ML classifier strongly flagged this PDF as malicious. The presence of an embedded file, specifically 'embedded_file_obj0010.bin', suggests it acts as a dropper for a secondary payload. The exact nature of the script execution is obscured, but the overall pattern points to a malicious PDF designed for payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

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.
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
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 0xB5C	84 bytes
`embedded_file_obj0003.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0xC0D	228 bytes
`embedded_file_obj0002.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xCFD	199 bytes
`embedded_file_obj0015.bin` `86051feca013523bea54849d5169ad44130deff0533731ff4b38fd438fe747d0`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xDEE	119 bytes
`embedded_file_obj0004.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0xEA5	77 bytes
`embedded_file_obj0013.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xF4C	56 bytes
`embedded_file_obj0010.bin` `67fbb0bdbdc12f039217bdd270fb0a77dd580b276e8f00661c4430ca43d5aa84`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x1284	12862 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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