PDF malware analysis — malicious · 9cc7eec9def50479

MALICIOUS

PDF

40.4 KB Created: 2012-05-21 15:17:25 +04:00 Authoring application: Adobe Designer 7.0

MD5: 050116d664cfc98c50a4fc93658b6baa SHA-1: a5ae924fadb0066858c205a5773bf1a2cab4bb4d SHA-256: 9cc7eec9def50479428b80ccf1ebb79360aa6c9b0dc6cd32e1fcb5f666592992

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains XFA form elements and a risky executable script, indicated by high-severity heuristics. The ML classifier also flagged this PDF as malicious. An embedded file, 'embedded_file_obj0042.bin', was extracted, suggesting it may contain a secondary payload. The unescape() call and embedded script payload point towards an attempt to execute malicious code.

Machine Learning

Nyx PDF Classifier malicious score 0.9986

Heuristics 8

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
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0040.bin` `c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb`	pdf-embedded-file	PDF EmbeddedFile object 40 at offset 0x7175	85 bytes
`embedded_file_obj0041.bin` `be1b34acf1e2a53a51c182c5e47f66fa2c21cbf510178e5753bed75e5fb40892`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x7227	1341 bytes
`embedded_file_obj0042.bin` `51fbb6e8a79d90b6b7e6431ad657e529b402c168c89c88ad344bd51d4254d62c`	pdf-embedded-file	PDF EmbeddedFile object 42 at offset 0x74BA	60027 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0043.bin` `3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169`	pdf-embedded-file	PDF EmbeddedFile object 43 at offset 0x84FE	144 bytes
`embedded_file_obj0044.bin` `ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd`	pdf-embedded-file	PDF EmbeddedFile object 44 at offset 0x85C0	2427 bytes
`font_00_cff_off0000126e.bin` `23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0`	pdf-font-stream	PDF embedded font (cff) at offset 0x126E	31178 bytes
`font_01_cff_off00008990.bin` `23b8b30e11470dd1ba6a3654d6ba1295fafa50e0fef4ed7956d19f35b61d0f9f`	pdf-font-stream	PDF embedded font (cff) at offset 0x8990	1192 bytes

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