PDF malware analysis — malicious · 791524d80efe2a03

MALICIOUS

PDF

15.0 KB Created: 2010-09-20 02:15:05 Authoring application: lei aah

MD5: 5faa9bbeb0d4f5e9e5f66858165e7973 SHA-1: 9a504d8700f048e3c5521ff8457f8de1dd0f51fa SHA-256: 791524d80efe2a03379abd952351f8a5b4cbc96399694e531b7af49eee015d33

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains XFA form elements with embedded JavaScript, triggering a heap spray exploit. This exploit is designed to download and execute a secondary payload, indicated by the embedded file artifact 'embedded_file_obj0005.bin'. The presence of unescape() calls and XFA heap spray heuristics strongly suggests a malicious intent to compromise the user's system.

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_obj0017.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0xE8D	84 bytes
`embedded_file_obj0002.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xF3E	228 bytes
`embedded_file_obj0010.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x102F	199 bytes
`embedded_file_obj0008.bin` `fbbe4a112063f382e228b2a0d38c939bd1139d7f5af1578162c3fe6f10f1310c`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x111F	119 bytes
`embedded_file_obj0018.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x11D7	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x127E	56 bytes
`embedded_file_obj0005.bin` `7c298d55d24d43abede9e421825b38c426e721d290738130cfa2399a0520aee4`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x15B6	15547 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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