PDF malware analysis — malicious · a777ed236507fbcf

MALICIOUS

PDF

15.4 KB Created: 2010-09-15 16:36:10 Authoring application: gym aha

MD5: ed688b3df2f0b8a9a9601e2d2b674989 SHA-1: fdcb868c6148331168da6ba0fc3b63983e21dd23 SHA-256: a777ed236507fbcf9deab98ea9b94075a7e28b2ceca42333b3da5462be661f35

208 Risk Score

Malware Insights

The PDF sample contains critical XFA heap spray exploit code and risky executable script, indicating it's designed to deliver a malicious payload. The ML classifier strongly flags this PDF as malicious. The presence of an embedded file, specifically 'embedded_file_obj0014.bin', suggests it's part of the exploit chain, likely containing or leading to the execution of the secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

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.
XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
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_obj0015.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xB58	84 bytes
`embedded_file_obj0003.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0xC09	228 bytes
`embedded_file_obj0016.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xCFA	199 bytes
`embedded_file_obj0011.bin` `81a94c5da7666daae4b82f46e491cf503879486c5da2c37d42662ea390319044`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0xDEB	119 bytes
`embedded_file_obj0019.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xEA4	77 bytes
`embedded_file_obj0013.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xF4B	56 bytes
`embedded_file_obj0014.bin` `1781c81ad79bce4ac2be4f87fcf4a287b8cdd535c401eabfe572ea027fb2cf24`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x1283	30196 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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