PDF malware analysis — malicious · 937306eec33ca0d9

MALICIOUS

PDF

12.2 KB Created: 2010-10-11 17:46:13 Authoring application: tux pea

MD5: c2d79e046966fbdbba98871c32138d5e SHA-1: 2c28a3f3a542c216bb0b969d8d4549c05a51f5ab SHA-256: 937306eec33ca0d9c69319cf0c9aaf26e9bb10fb0f8dab21ebb9b69158ebb09b

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204 User Execution

This PDF sample utilizes XFA JavaScript heap-spray exploit code, as indicated by the 'PDF_XFA_HEAP_SPRAY' heuristic. The 'PDF_UNESCAPE' and 'PDF_XFA_SCRIPT' heuristics further confirm the presence of executable script within the XFA form. The ML classifier strongly flags this PDF as malicious. The embedded file 'embedded_file_obj0016.bin' is likely the secondary payload. The overall attack pattern suggests the exploitation of a PDF vulnerability to deliver and execute further malicious content.

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_obj0011.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0xC21	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0xCD2	228 bytes
`embedded_file_obj0007.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0xDC2	199 bytes
`embedded_file_obj0005.bin` `5e391be22a3d9da94920917b0b2f7aaaf46e785860a246c72d4eb7e38d5b36c3`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0xEB2	119 bytes
`embedded_file_obj0002.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xF69	77 bytes
`embedded_file_obj0015.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x1010	56 bytes
`embedded_file_obj0016.bin` `602a50f8231bffca1b798ced6b63e9d4b81b600445db158e9d85deeaa3fcaf30`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x134A	11137 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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