PDF malware analysis — malicious · 58291855d611ba81

MALICIOUS

PDF

12.6 KB Created: 2010-09-21 07:00:42 Authoring application: erg yom

MD5: 6d78704021f1a7e0caa0332419feb8d4 SHA-1: bb09cbb3435724d29b5d6c6d4ea9c8215df236f9 SHA-256: 58291855d611ba8156cf8a248ab7363c6172d435a262cd5e862441c1628e971b

178 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF sample contains XFA form elements with JavaScript that triggers a heap spray exploit. This exploit is designed to de-obfuscate and execute a script payload embedded within the PDF. The embedded file 'embedded_file_obj0016.bin' is likely the second-stage payload. The presence of XFA heap spray and embedded script indicates 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_obj0004.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0xD0B	84 bytes
`embedded_file_obj0001.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0xDBC	228 bytes
`embedded_file_obj0019.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xEAD	199 bytes
`embedded_file_obj0015.bin` `bbc35c365853f7c8c639d19685b4a2b63a969de1d119a32c574469fedfcde802`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xF9E	119 bytes
`embedded_file_obj0017.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x1056	77 bytes
`embedded_file_obj0006.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x10FC	56 bytes
`embedded_file_obj0016.bin` `b23838626345385855e094d2c83178fc8aa2d8ae1d0e8ea67182bff70415ec8b`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x1433	11443 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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