PDF malware analysis — malicious · 2b2997cb6d117bda

MALICIOUS

PDF

14.3 KB Created: 2010-09-06 16:21:00 Authoring application: shh nit

MD5: f421819dd6cecd0447fb1c224915aa18 SHA-1: 0da9e0f4ff8fcac439e0bea8d99b0ca833b8c102 SHA-256: 2b2997cb6d117bda4dfd66c698e86a37ac7fd963f4e1a62e00dd645acf94bddf

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

This PDF sample utilizes XFA form elements and JavaScript to trigger a heap spray exploit. The 'PDF_XFA_HEAP_SPRAY' and 'PDF_XFA_SCRIPT' heuristics indicate the presence of exploit code designed to execute arbitrary scripts. The 'ML_NYX_PDF_MALICIOUS' score of 0.999892 strongly suggests malicious intent. The embedded file 'embedded_file_obj0013.bin' is likely the secondary payload. The attack pattern is consistent with exploiting PDF vulnerabilities to deliver further malware.

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_obj0003.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0xB41	84 bytes
`embedded_file_obj0008.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xBF2	228 bytes
`embedded_file_obj0019.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xCE3	199 bytes
`embedded_file_obj0001.bin` `60a3fbd7c3045150572216ade949827efc2ebd6dd1d3649b42a28a2741ae85fb`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0xDD3	119 bytes
`embedded_file_obj0006.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0xE8A	77 bytes
`embedded_file_obj0015.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xF31	56 bytes
`embedded_file_obj0013.bin` `4088891bf1f0544dfaac568b0cccb834eb5f4ab5b2997129d44e3e615b025acd`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x126B	15942 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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