PDF malware analysis — malicious · a0428e57c65c790d

MALICIOUS

PDF

2.77 MB Created: 2007-03-05 12:49:21 +01:00 Authoring application: PDFPublishing (via Adobe Acrobat 3D Toolkit 4.1.0.0)

MD5: e1d191146acd3f95b2672e0ef0bf9500 SHA-1: 406a353e7ae3c556b87d10079c47215deb8a3204 SHA-256: a0428e57c65c790da3021da4242cb42fee396ade7a7b91703a0a9a8bf1a22d4c

342 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains multiple high-severity heuristics indicating malicious intent, including eval() and unescape() calls within embedded JavaScript, and an embedded file with suspicious static findings. The ML classifier also flagged this PDF with high confidence. The embedded JavaScript is likely used to download and execute a secondary payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'PDF_XFA_SCRIPT' firings. The presence of embedded files, including a .stp file, further supports this. The attack pattern is consistent with a malicious PDF used for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9587

Heuristics 15

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.
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
Embedded PDF child has suspicious static findings critical PDF_EMBEDDED_CHILD_STATIC_TRIAGE

PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
Suspicious extracted artifact medium 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.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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/xhtml
- http://www.xfa.org/schema/xfa-data/1.0/
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/photoshop/1.0/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://www.your.domain.com
- http://purl.org/dc/elements/1.1/

Extracted artifacts 16

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x19448F	85 bytes
`embedded_file_obj0009.bin` `a52b82794b2ba40374c792119eaacd1948b550eac1e6dd2673e3648cb6959149`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x194540	1333 bytes
`embedded_file_obj0010.bin` `53d686b52276fc65cd816534aa6c78b3a153cf34028bed6d3e4de9deca80100c`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x1947C2	66979 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 17 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `5f46a4aa50bf20cf566ff569220627bd3d337eb0f82d34eb699337756ad09c73`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x19EAD2	2262 bytes
`embedded_file_obj0012.bin` `e45851fdfd997f7b3eae0f62d6f4820fe7801f3abb9b20f7bb34e90c22f8e732`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x19EDB5	142 bytes
`embedded_file_obj0013.bin` `66d8a74dff255b9199ca501fdac605ddf6ab59cd1e319e3123eed98124d9abea`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x19EE7B	724 bytes
`embedded_file_obj0014.bin` `a60265344cf1a9e94da34c8f587f64a4297e2fa417c895852209903ab7588bcc`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x19F05A	85 bytes
`disclaimer.pdf` `890cb280c647c2743048717ed8c46eb42225594f115f08c85db53169c8ea46b5`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x19F209	10232 bytes
`24563-432.stp` `e03d21118e203dca811b1c432871fab224cb9767a5bfd2094ab8a0b978a8fec7`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x1AA658	4194304 bytes
`javascript_obj0029_000.js` `c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a`	pdf-javascript-stream	PDF /JS object 29 at offset 0x8D8	1528 bytes
`javascript_obj0030_001.js` `4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb`	pdf-javascript-stream	PDF /JS object 30 at offset 0xABC	870 bytes
`javascript_obj0031_002.js` `c2d25683b87f35b2c97fd55b4b4d3fb2c8e428989cc7f8de755a12031e1ce557`	pdf-javascript-stream	PDF /JS object 31 at offset 0xC11	3843 bytes
`javascript_obj0068_003.js` `ea238b8411ff1778f7d753773cf7385e1f004be621419e4a838668af339ad28a`	pdf-javascript-stream	PDF /JS object 68 at offset 0x1929A8	28388 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 26 long hex-escaped blob(s).
`stream_013_off00024ccb.bin` `58784d0900e72d495a2d6189537e9724676a089a72396799214dbfff7f670848`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x24CCB	2594988 bytes
`font_00_cff_off000070be.bin` `28345a751bc247acbf8155171a43d69e366aa8df344a8a0a8a8304436513e01c`	pdf-font-stream	PDF embedded font (cff) at offset 0x70BE	66185 bytes
`font_01_cff_off00012532.bin` `96161e3d15cf67591ef2a1c87940c8dc0af59a94fcfab5d6bfcf4cb992a24af8`	pdf-font-stream	PDF embedded font (cff) at offset 0x12532	64586 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.45, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.