PDF malware analysis — malicious · 52585805b8f182aa

MALICIOUS

PDF

11.9 KB Created: 2011-01-17 08:53:39 Authoring application: taj ape

MD5: 4025d5e45a535131f92c57ca964382d7 SHA-1: 0102a74c38543c6253db92f66d9f65d045ce7537 SHA-256: 52585805b8f182aa56d09b4385a602c21a9a93fd2f59766a2b588658c55a172a

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution

The PDF sample contains critical XFA JavaScript heap-spray exploit code, indicating an attempt to execute arbitrary code. The presence of embedded files, including a significant one named 'embedded_file_obj0009.bin', suggests a downloader or dropper functionality. The unescape() call and embedded script payload further support the malicious intent.

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_obj0003.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0xA65	84 bytes
`embedded_file_obj0005.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0xB16	228 bytes
`embedded_file_obj0008.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xC06	199 bytes
`embedded_file_obj0010.bin` `70ba1432f2cfe6f1e1f6dc4d0b7ad2ca1f294bd09cb10d2545abeb5a53079469`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0xCF7	119 bytes
`embedded_file_obj0002.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xDAE	77 bytes
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xE55	56 bytes
`embedded_file_obj0009.bin` `0d4ff570d30e77e7bd2dbc8f744ce775c0f31acd166afe926b5392c683bcee94`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x118C	11461 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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