PDF malware analysis — malicious · a0bf3801e94391be

MALICIOUS

PDF

12.5 KB Created: 2010-10-19 18:29:01 Authoring application: mel rad

MD5: 1143790eb3187d63513de23ada38b53f SHA-1: bb4cff7284e27d73f0875ac3525818cd6fe8a25f SHA-256: a0bf3801e94391befd273e4870c37292b235834d1543e7985683e43195077904

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains multiple high-severity heuristics indicating the presence of risky executable scripts within XFA forms, along with an unescape() call. An embedded file, 'embedded_file_obj0019.bin', was also extracted, which is likely the payload. The ML classifier strongly flagged this PDF as malicious. The combination of these factors suggests a malicious PDF designed to exploit vulnerabilities and deliver a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

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.
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 0x94B	84 bytes
`embedded_file_obj0011.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x9FD	228 bytes
`embedded_file_obj0018.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0xAEE	199 bytes
`embedded_file_obj0012.bin` `f6ec0c8ade17f0512ccfbbce275f00f34a7b30bddbba19eda5bc4627c0765ee9`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0xBDF	119 bytes
`embedded_file_obj0008.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xC97	77 bytes
`embedded_file_obj0005.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0xD3D	56 bytes
`embedded_file_obj0019.bin` `4e04348f8f6a2241473c50eae77883baab13f85e55e5d94b06054d6d5ba66aa3`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0x1074	12635 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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